Clean up host_app_ephemeral_cocoapods Profile build settings (#36498)

packages/flutter_tools/templates/module/ios/host_app_ephemeral_cocoapods/Config.tmpl/Release.xcconfig

diff --git a/packages/flutter_tools/templates/module/ios/host_app_ephemeral_cocoapods/Config.tmpl/Release.xcconfig b/packages/flutter_tools/templates/module/ios/host_app_ephemeral_cocoapods/Config.tmpl/Release.xcconfig
index 4fc6f7f..d452747 100644
--- a/packages/flutter_tools/templates/module/ios/host_app_ephemeral_cocoapods/Config.tmpl/Release.xcconfig
+++ b/packages/flutter_tools/templates/module/ios/host_app_ephemeral_cocoapods/Config.tmpl/Release.xcconfig
@@ -1,3 +1,2 @@
 #include "Flutter.xcconfig"
 #include "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
-FLUTTER_BUILD_MODE=release