25452: Fixing indent on menu items with check marks and/or icons

[krasko78]

Resolves: #25452

The widths of the labels for the check mark and the icon were set to 16 which was on the low side. The Layout seems to respect those widths only for empty labels (no check mark, no icon): try changing those widths to 100 for example. The result is only the menu items without check marks and icons are indented, those with check marks and/or icons do not move. Therefore I have set the preferred widths on the Layout instead.

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