[GAMEPLAY] Team Builder "Ready" Button Fails To Enter Disabled State

Summary: After gathering a full team in Team Builder, if you hover your mouse over the "Ready" button and someone leaves the lobby, the "Ready" button still behaves and makes sound as if the whole team is still there. This doesn't actually cause your summoner's area to highlight or anything, but the button displays hover, mouse-down, and mouse-up states (complete with sound effects). If you don't hover over the button when someone leaves, the "Ready" button goes into a disabled state (which seems to be the intended behavior).

Steps to Reproduce:

1. Gather a full team in Team Builder.
2. Hover your cursor over the "Ready" button.
3. Have someone leave the team, with the cursor still over the "Ready" button.
4. Ready button still functions as if the team were complete.