Merge pull request #696 from wimbledon/facebook_fix

Facebook Auth Crash Fix

Author: morganchen12

FacebookAuth/FirebaseFacebookAuthUI/FUIFacebookAuth.m

@@ -222,7 +222,7 @@ - (void)callbackWithCredential:(nullable FIRAuthCredential *)credential
     @brief Validates that Facebook SDK data was filled in Info.plist and creates Facebook login manager 
  */
 - (void)configureProvider {
-  NSBundle *bundle = [FUIAuthUtils bundleNamed:nil];
+  NSBundle *bundle = [NSBundle mainBundle];
   NSString *facebookAppId = [bundle objectForInfoDictionaryKey:kFacebookAppId];
   NSString *facebookDisplayName = [bundle objectForInfoDictionaryKey:kFacebookDisplayName];