[RN] Add missing key prop to Android page indicator

react/features/base/react/components/native/PagedList.android.js

         return page.component
             ? <TouchableOpacity
                 disabled = { disabled }
+                key = { index }
                 onPress = { this._onIconPress(index) }
                 style = { styles.pageIndicator } >
                 <View style = { styles.pageIndicator }>