kcms/rules: Make Comboboxes bordered again
This property was set since the QML redesign and remained unnoticed because it didn't actually work.
Now that the qqc2-desktop style has been fixed and correctly draws flat (non-bordered) comboboxes let's remove it for a nicer look (just the same as the have had all this time)
BEFORE | AFTER |
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This applies to master (frameworks/qqc2-desktop-style!236 (merged)) and stable (frameworks/qqc2-desktop-style@15b2feac)