If PIE is paused using the 'Pause key', the Pause or Resume buttons on the toolbar will no longer start PIE

If PIE is paused using the 'Pause key', the Pause or Resume buttons on the toolbar will no longer start PIE. You have to make sure that the icon is toggled to Pause, select the viewport, and then press the 'Pause key' again to resume play.

1. Open QA-Game
2. Once loaded, press Play to start PIE
3. Select the viewport to change focus
4. While moving around, press the 'Pause key'
5. The mouse will change focus to the editor
6. Try to unpause PIE by left-mouse clicking the Pause icon in the toolbar
7. It will toggle to the Resume icon
8. Try to unpause PIE by left-mouse clicking the Resume icon

Results: Clicking the Pause/Resume icon will not unpause PIE. It will only toggle between them.

(Note: To unpause PIE, you will need to make sure that the icon is toggled back to Pause, click in the viewport, and press the 'Pause key'.)

Expected: When the 'Pause key' is pressed, the icon changes to Resume and if clicked, it will unpause PIE.

4.7p5 Pause hotkey does not update toolbar icons, won't resume