Pause bugs

[thelusiv]

Two more small issues I found while playing:

* When the game is paused using Options -> Controls -> Assign Controls -> Game Controls -> Pause, it stops play but does not enter the pause menu until I press Escape.
* If there is a cloud of smoke on screen and the game is paused (either using the Pause control or by pressing Escape directly), the cloud still clears while the game is paused.