title: ./gradle bundlerelease not generating aab
body: <p>I was trying to build an app via ./gradle bundlerelease
  got an error everytime:</p>
  <pre><code>C:\Users\xxx\Desktop\app\node_modules\@react-native-firebase\app\android\src\reactnative\java\io\invertase\firebase\app\ReactNativeFirebaseAppInitProvider.java:25: error: cannot find symbol
  BuildConfig.APPLICATION_ID + &quot;.reactnativefirebaseappinitprovider&quot;;
             ^
  </code></pre>
  <p>symbol:   variable APPLICATION_ID
  location: class BuildConfig
  1 error</p>
  <p>FAILURE: Build failed with an exception.</p>
  <ul>
  <li>What went wrong:
  Execution failed for task ':react-native-firebase_app:compileReleaseJavaWithJavac'.</li>
  </ul>
  <blockquote>
  <p>Compilation failed; see the compiler error output for details.</p>
  </blockquote>