Add support for --use-application-binary on iOS (#6318)

Fixes #6283
diff --git a/packages/flutter_tools/lib/src/ios/mac.dart b/packages/flutter_tools/lib/src/ios/mac.dart
index 9016171..f217e12 100644
--- a/packages/flutter_tools/lib/src/ios/mac.dart
+++ b/packages/flutter_tools/lib/src/ios/mac.dart
@@ -100,7 +100,7 @@
 }
 
 Future<XcodeBuildResult> buildXcodeProject({
-  IOSApp app,
+  BuildableIOSApp app,
   BuildMode mode,
   String target: flx.defaultMainPath,
   bool buildForDevice,