Set min height for Tournament winners

[NSK07]

Set minimum height when only Tournament winners is getting displayed in the lobby screen. This will fix #14864 .Adding screenshots before and after code change for reference:
Before :

After :

[randompearl-stack]

This only fixes the tournament winners, the leaderboard div will still be missing.

when rating not shown

when rating is shown

[NSK07]

@randompearl-stack when you turn off Show player ratings it is suppose to remove the leaderboard as well as other places where rating is showed. The issue is that when the leaderboard gets removed, Tournament Winners has very low space. This code is to fix the height issue.

[randompearl-stack]

Okay nevermind, the fix works, I thought that it would still show the leaderboard but without the players' ratings, like how the leaderboard page shows only the names of the top players.