WindowSwitcher: correctly scale icons and rounded corners #5547

Job	Run time
fedora	1m 17s
build-and-test (stable)	55s
lint	9s
open-suse-leap	5m 51s
build-and-test (development-target)	1m 3s
build-and-test (unstable)	1m 5s
	10m 20s

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