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/TextInputExample.ios.js

@@ -490,9 +490,6 @@ class AutogrowingTextInputExample extends React.Component<
 }
 
 const styles = StyleSheet.create({
-  page: {
-    paddingBottom: 300,
-  },
   default: {
     borderWidth: StyleSheet.hairlineWidth,
     borderColor: '#0f0f0f',
@@ -520,13 +517,6 @@ const styles = StyleSheet.create({
     fontFamily: 'Cochin',
     height: 60,
   },
-  multilineChild: {
-    width: 50,
-    height: 40,
-    position: 'absolute',
-    right: 5,
-    backgroundColor: 'red',
-  },
   eventLabel: {
     margin: 3,
     fontSize: 12,