Remove redundant button in OptionsScreen

e2e/Options.test.js

   it('set title after setting react component', async () => {
     await elementById(TestIDs.SET_REACT_TITLE_VIEW).tap();
     await expect(elementByLabel('Press Me')).toBeVisible();
-    await elementById(TestIDs.SET_TITLE).tap();
-    await expect(elementByLabel('Title')).toBeVisible();
+    await elementById(TestIDs.CHANGE_TITLE_BTN).tap();
+    await expect(elementByLabel('Title Changed')).toBeVisible();
   });
 
   it('Popping screen with yellow box should not crash', async () => {

playground/src/screens/OptionsScreen.js

         <Button label='Push' testID={PUSH_BTN} onPress={this.push} />
         <Button label='Hide TopBar in DefaultOptions' testID={HIDE_TOPBAR_DEFAULT_OPTIONS} onPress={this.hideTopBarInDefaultOptions} />
         <Button label='Set React Title View' testID={SET_REACT_TITLE_VIEW} onPress={this.setReactTitleView} />
-        <Button label='Set Title' testID={SET_REACT_TITLE_VIEW} onPress={this.setTitle} />
         <Button label='Show Yellow Box' testID={SHOW_YELLOW_BOX_BTN} onPress={() => console.warn('Yellow Box')} />
         <Button label='StatusBar' onPress={this.statusBarScreen} />
       </Root>
     }
   });
 
-  setTitle = () => Navigation.mergeOptions(this, {
-    topBar: {
-      title: {
-        text: 'Title'
-      }
-    }
-  });
-
   statusBarScreen = () => Navigation.showModal(Screens.StatusBar);
 }