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kde: replace `kdeglobals` with `Kvantum` theme #1051

Job	Run time
List packages	24s
docs on x86_64-darwin	1m 15s
palette-generator on x86_64-darwin	2m 7s
docs on x86_64-linux	36s
palette-generator on x86_64-linux	37s
testbed-gnome-dark on x86_64-linux	4m 21s
testbed-gnome-light on x86_64-linux	4m 39s
testbed-kde-dark on x86_64-linux	3m 10s
testbed-kde-light on x86_64-linux	2m 52s
	20m 1s

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