Fix inline styles warning in Libraries (#22161)

Summary:
Fixes `react-native/no-inline-styles` eslint warnings in the `Libraries` module.
Pull Request resolved: https://github.com/facebook/react-native/pull/22161

Differential Revision: D12946899

Pulled By: TheSavior

fbshipit-source-id: c97ffa50dd90529dabf30a3d2cb09476acc568cb

Libraries/Experimental/WindowedListView.js

@@ -777,11 +777,7 @@ class CellRenderer extends React.Component<CellProps> {
     if (DEBUG) {
       infoLog('render cell ' + this.props.rowIndex);
       const Text = require('Text');
-      debug = (
-        <Text style={{backgroundColor: 'lightblue'}}>
-          Row: {this.props.rowIndex}
-        </Text>
-      );
+      debug = <Text style={styles.debug}>Row: {this.props.rowIndex}</Text>;
     }
     const style = this._includeInLayoutLatch ? styles.include : styles.remove;
     return (
@@ -819,6 +815,9 @@ const styles = StyleSheet.create({
     right: -removedXOffset,
     opacity: DEBUG ? 0.1 : 0,
   },
+  debug: {
+    backgroundColor: 'lightblue',
+  },
 });
 
 module.exports = WindowedListView;