[BUG] Application doesnt stop when showing Interstitial or Reward ad on iOS

[gumaciel]

OS target (Android/iOS):
iOS

Godot version:
3.1.2

Issue description:
When the user emits the reward or interstitial ad to appear on Android the game stops, but on iOS, the game continues to running in background, causing it to force the programmer to make adjustments to the game code (get_tree(). paused = true), and on Android this is not necessary, only on iOS

[gumaciel]

If anyone has any idea how to pause the application in the module code, it will be of great help, I can test the implementation