Removes the dark theme installation #557

Job	Run time
collect-github-api-artifacts	8s
create-splash-image	4s
build-linux-user	8m 51s
build-linux-dev	8m 39s
build-linux-user-ci	7m 45s
build-windows-user	11m 30s
build-linux-dev-ci	6m 50s
build-macos-user	29m 14s
build-macos-arm-dev	8m 3s
build-macos-dev	22m 9s
build-macos-dev-hipe	17m 38s
build-windows-dev	18m 8s
build-macos-arm-dev-hipe	11m 34s
build-windows-dev-hipe	9m 33s
build-macos-arm-user	15m 10s
build-linux-dev-hipe	13m 51s
create-release	-1s
	3h 9m 6s

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