Add new option for "random skin" selection that ignores the specific skin that doesn't support currently gamemode

[youth0530]

Current specification

Currently, the random skin also selects the skin that doesn't support the game that the player is playing on,
For example, WhiteCat skin doesn't support mania gamemode, but it is included in random skin's selecting candidate,
And this can be annoying to the player who uses random skin especially with keybind, during the match.

Here's my suggestion: Add an option to the "Random skin", that ignores the skin that doesn't support the current playing gamemode.