Fix bad block type in Auth

Change-Id: Id9292429738b6e170ccf10819f2cd0ff25ced518

Author: morganchen12

FirebaseAuthUI/AccountManagement/FUIAccountSettingsOperation.m

@@ -180,7 +180,8 @@ - (void)reauthenticateWithProvider:(NSString *)providerID
     }
     [self.delegate.auth.currentUser
         reauthenticateAndRetrieveDataWithCredential:credential
-                                         completion:^(NSError *_Nullable reauthError) {
+                                         completion:^(FIRAuthDataResult *_Nullable authResult,
+                                                      NSError *_Nullable reauthError) {
       [self.delegate decrementActivity];
       if (result) {
         result(self.delegate.auth.currentUser, reauthError);