update firebase UI

Author: squalle0nhart

Auth/FirebaseAuthUI/FUIAuthPickerViewController.m

@@ -164,7 +164,7 @@ - (void)viewDidLayoutSubviews {
  CGFloat centerY = CGRectGetHeight(self.view.bounds) - distanceFromCenterToBottom;
  // Compensate for bounds adjustment if any.
 // centerY += self.view.bounds.origin.y;
- _buttonContainerView.center = CGPointMake(self.view.center.x, 300);
+ _buttonContainerView.center = CGPointMake(self.view.center.x, 250);
  return;
  }