Pressing start key results in luma crash.

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Platform: n3ds
Issue:
Pressing start results in a crash on the n3ds.
OBSOLETESolution:
Move the start keypress check before activeMenu->handleInput()

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It seems that the issue is primarily present when the start key is pressed during a sort. From the fix I submitted, the program didn't crash when quiting it in the middle of the first 5 or so sorts I did. When I increased the array elements to 100 and tried to reproduce the issue, my fork also crashed.

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Added another commit to my pull request that fixes this issue by preventing quitting in the middle of a sort. Also to prevent starting another sort when a sort is already running.