[Qt] fix style, formating, comment and indentation problems

[Diapolo]

• introduced by [QT] Fixes feel when resizing the last column on tables (issue #2862) #3920

[Diapolo]

@laanwj Can you please take a look and merge this, I have less motivation currently, as my old pulls seem all to be just ignored, even ones that are ACKd already.

See #3698, #3682 or #3603...

[laanwj]

@Diapolo Sorry, seems those got stuck.
(for core pull requests I wait for more ACKs, not just mine, but if it's a trivial style fix it shouldn't have to wait that long...)
We really, really need more people that do code review/testing...

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