fix #304959: fix clipping and scaling of Key Signatures palette in New Score wizard #6167
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Resolves: https://musescore.org/en/node/304959
Ensures accounting for GUI scaling in PaletteListView and uses a
different approach to prevent large gaps between palette cells
(using setGridSize() call instead of setting negative spacing).
This approach prevents clipping of some cells in that palette.
Collaboratively developed in the Telegram chat discussion with @MarcSabatella so I put a co-authorsip in the commit :)