placessidebar: Simplify some code
placessidebar: Simplify some code

Use existing functions, instead of open-coding manipulation
of string arrays.

grubersjoe/adwaita,chergert/gtk,jadahl/gtk,chergert/gtk,jadahl/gtk,davidgumberg/gtk,chergert/gtk,Adamovskiy/gtk,davidgumberg/gtk,davidgumberg/gtk,jigpu/gtk,jadahl/gtk,davidgumberg/gtk,jigpu/gtk,jigpu/gtk,davidgumberg/gtk,jigpu/gtk,alexlarsson/gtk,Adamovskiy/gtk,chergert/gtk,chergert/gtk,jadahl/gtk,grubersjoe/adwaita,grubersjoe/adwaita,Adamovskiy/gtk,davidgumberg/gtk,jigpu/gtk,davidgumberg/gtk,alexlarsson/gtk,jigpu/gtk,chergert/gtk,alexlarsson/gtk,davidgumberg/gtk,jigpu/gtk,chergert/gtk,alexlarsson/gtk,jadahl/gtk,Adamovskiy/gtk,Adamovskiy/gtk,alexlarsson/gtk,chergert/gtk,alexlarsson/gtk,jadahl/gtk,grubersjoe/adwaita,grubersjoe/adwaita,jigpu/gtk,alexlarsson/gtk,jadahl/gtk,alexlarsson/gtk,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,Adamovskiy/gtk,jadahl/gtk,Adamovskiy/gtk,Adamovskiy/gtk