Resolve RNTester Xcode warnings

[safaiyeh]

Summary

Resolve RNTester Xcode warnings.

Changelog

[Internal] [iOS] - Resolve RNTester Xcode warnings

Test Plan

Building RNTester no longer shows project setting warnings

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	6,759,422	0
android	hermes	armeabi-v7a	6,406,537	0
android	hermes	x86	7,140,904	0
android	hermes	x86_64	7,032,199	0
android	jsc	arm64-v8a	8,927,996	0
android	jsc	armeabi-v7a	8,567,471	0
android	jsc	x86	8,752,596	0
android	jsc	x86_64	9,329,505	0

Base commit: 0a67133

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	809,568	0

Base commit: 0a67133

[facebook-github-bot]

@shergin is landing this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[shergin]

@safaiyeh It does not compile saying The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.

[react-native-bot]

This pull request was successfully merged by @safaiyeh in 6de9f37.

^{When will my fix make it into a release? | Upcoming Releases}