Fix fidchangelistener behavior

[eldhosembabu]

Fixing fidchangelistener behavior to get invoked for new fid creations as well

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[Doris-Ge]

nit: It may be more readable to clearly define what means a new FID, e.g.:

boolean isNewFidRegistered(PersistedInstallationEntry prefs, PersistedInstallationEntry updatedPrefs) {
   if (!TextUtils.equals(
            prefs.getFirebaseInstallationId(), updatedPrefs.getFirebaseInstallationId()) {
       return true;
   }
   if (!prefs.isRegistered() && updatedPrefs.isRegistered()) {
       return true;
   }
   return false;
}