Remove leftover app.so references (#4531)

This file is now app.dylib.
diff --git a/examples/hello_services/ios/.gitignore b/examples/hello_services/ios/.gitignore
index fdc9f59..f1521f6 100644
--- a/examples/hello_services/ios/.gitignore
+++ b/examples/hello_services/ios/.gitignore
@@ -31,7 +31,7 @@
 .tags*
 
 /Flutter/app.flx
-/Flutter/app.so
+/Flutter/app.dylib
 /Flutter/app.zip
 /Flutter/Flutter.framework
 /Flutter/Generated.xcconfig
diff --git a/examples/hello_services/ios/HelloServices.xcodeproj/project.pbxproj b/examples/hello_services/ios/HelloServices.xcodeproj/project.pbxproj
index b874085..a2ea9ea 100644
--- a/examples/hello_services/ios/HelloServices.xcodeproj/project.pbxproj
+++ b/examples/hello_services/ios/HelloServices.xcodeproj/project.pbxproj
@@ -7,7 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
-		9705A1C51CF9049000538489 /* app.so in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 9740EEB81CF902C7004384FC /* app.so */; settings = {ATTRIBUTES = (CodeSignOnCopy, ); }; };
+		9705A1C51CF9049000538489 /* app.dylib in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 9740EEB81CF902C7004384FC /* app.dylib */; settings = {ATTRIBUTES = (CodeSignOnCopy, ); }; };
 		9705A1C61CF904A100538489 /* Flutter.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 9740EEBA1CF902C7004384FC /* Flutter.framework */; };
 		9705A1C71CF904A300538489 /* Flutter.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 9740EEBA1CF902C7004384FC /* Flutter.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		9740EEB41CF90195004384FC /* Flutter.xcconfig in Resources */ = {isa = PBXBuildFile; fileRef = 9740EEB21CF90195004384FC /* Flutter.xcconfig */; };
@@ -28,7 +28,7 @@
 			dstPath = "";
 			dstSubfolderSpec = 10;
 			files = (
-				9705A1C51CF9049000538489 /* app.so in Embed Frameworks */,
+				9705A1C51CF9049000538489 /* app.dylib in Embed Frameworks */,
 				9705A1C71CF904A300538489 /* Flutter.framework in Embed Frameworks */,
 			);
 			name = "Embed Frameworks";
@@ -40,7 +40,7 @@
 		9740EEB21CF90195004384FC /* Flutter.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; name = Flutter.xcconfig; path = Flutter/Flutter.xcconfig; sourceTree = "<group>"; };
 		9740EEB31CF90195004384FC /* Generated.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; name = Generated.xcconfig; path = Flutter/Generated.xcconfig; sourceTree = "<group>"; };
 		9740EEB71CF902C7004384FC /* app.flx */ = {isa = PBXFileReference; lastKnownFileType = file; name = app.flx; path = Flutter/app.flx; sourceTree = "<group>"; };
-		9740EEB81CF902C7004384FC /* app.so */ = {isa = PBXFileReference; lastKnownFileType = "compiled.mach-o.dylib"; name = app.so; path = Flutter/app.so; sourceTree = "<group>"; };
+		9740EEB81CF902C7004384FC /* app.dylib */ = {isa = PBXFileReference; lastKnownFileType = "compiled.mach-o.dylib"; name = app.dylib; path = Flutter/app.dylib; sourceTree = "<group>"; };
 		9740EEBA1CF902C7004384FC /* Flutter.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Flutter.framework; path = Flutter/Flutter.framework; sourceTree = "<group>"; };
 		977505171CFDF21E00BC28DA /* LocationProvider.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = LocationProvider.h; sourceTree = "<group>"; };
 		977505181CFDF23500BC28DA /* LocationProvider.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = LocationProvider.m; sourceTree = "<group>"; };
@@ -70,7 +70,7 @@
 			isa = PBXGroup;
 			children = (
 				9740EEB71CF902C7004384FC /* app.flx */,
-				9740EEB81CF902C7004384FC /* app.so */,
+				9740EEB81CF902C7004384FC /* app.dylib */,
 				9740EEBA1CF902C7004384FC /* Flutter.framework */,
 				9740EEB21CF90195004384FC /* Flutter.xcconfig */,
 				9740EEB31CF90195004384FC /* Generated.xcconfig */,