Fix gui mess when adding multiple teams at once

When multiple teams are added at once (example: join place, leaderboard loads before game does, then adds teams) the list is messed up until the next update because the tweening isn't canceled, resulting in player names and team names being on the same line for a time.

This removes that issue by simply removing the animation unless/until a better change, which instead cancels the tweening, can be made.
Merge pull request #10 from Zytharian/patch-1

Fix gui mess when adding multiple teams at once (PlayerList.lua)