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

ReactAndroid/src/androidTest/js/UIManagerTestModule.js

@@ -48,13 +48,6 @@ const FlexTestAppStyles = StyleSheet.create({
   child: {
     flex: 1,
   },
-  absolute: {
-    position: 'absolute',
-    top: 15,
-    left: 10,
-    width: 50,
-    height: 60,
-  },
   bgRed: {
     backgroundColor: '#ff0000',
   },