Redesign for Multitouch settings dialog for STK 1.5.1 idea

[GustaLOLE]

Revamp the multitouch settings dialog by GustaLOLE · Pull Request #5789 · supertuxkart/stk-code · GitHub

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After:
   

[Sven]

Nice!
Certainly an improvement.

[Alayan]

That looks better, indeed. Having the icons (like in the pause menu) for the main control types helps a lot to make this screen less confusing.