Revert EXCLUDED_ARCHS[sdk=iphonesimulator*] back to i386

Rosetta 2 was/is for Intel x86 apps to run on arm64 (M1).

Excluding arm64 was needed opening older Xcode w Rosetta 2 to build x86_64.

We no longer need Xcode w Rosetta 2 since Xcode and React Native upgrades.

So can now again exclude i386 again to build arm64.

Clearing Xcode/DerivedData needed when switching.

Ref: react-native-community/react-native-template-typescript#223

Ref: react-native-community/react-native-template-typescript#224

ios/MyApp.xcodeproj/project.pbxproj

@@ -588,7 +588,7 @@
 				COPY_PHASE_STRIP = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
-				"EXCLUDED_ARCHS[sdk=iphonesimulator*]" = arm64;
+				"EXCLUDED_ARCHS[sdk=iphonesimulator*]" = i386;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_NO_COMMON_BLOCKS = YES;
@@ -649,7 +649,7 @@
 				COPY_PHASE_STRIP = YES;
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
-				"EXCLUDED_ARCHS[sdk=iphonesimulator*]" = arm64;
+				"EXCLUDED_ARCHS[sdk=iphonesimulator*]" = i386;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;