[Client] User can be trapped in mastery edit menu while in Champion Select.

This defect is produced because the user does not have control of window movement "after" edit mastery is selected in Champion Select. This only occurs in the mastery edit menu as the store still has the capability of moving the window on the upper most portion. In Champion select, the mastery edit menu has an overlay that has the focus, and the user can no longer type, exit, or move the window. Effectively the user is trapped in the menu without any means to exit (aka trapping). Easiest method to reproduce this bug is to:

1. Cue up for any game mode
2. Accept game and proceed to Champion Select menu
3. Move the lol window to the left so that the exit button of the mastery window is off screen (This should be roughly 40-45% of the window off screen)
4. Open the mastery edit menu.
5. Make edits and then attempt to return to game.

Additionally, by doing this the user is unable to edit Defensive tree masteries. This defect is not as "edge case" as it may appear. I found this when i was attempting to match my masteries with a guide from solomid.net and moved the window to the right so i can see them. After I saved, I realized i was unable to close the window. Since this was in Team Builder i was also unable to ready up or chat to players and was kicked from the game. As trivial as this may appear, it is a valid issue.