Remove unused styles (#22083)

Summary:
Removes unused styles.

NOTE: Lint rule `react-native/no-unused-styles` not added because of custom lint rule internally at Facebook that does this.
Pull Request resolved: https://github.com/facebook/react-native/pull/22083

Differential Revision: D12929443

Pulled By: TheSavior

fbshipit-source-id: d42b0be3db745e445447e65df3b78b61f53e4229

RNTester/js/PermissionsExampleAndroid.android.js

@@ -119,10 +119,6 @@ const styles = StyleSheet.create({
     flex: 1,
     backgroundColor: 'white',
   },
-  singleLine: {
-    fontSize: 16,
-    padding: 4,
-  },
   text: {
     margin: 10,
   },