Removes the dark theme installation #555

Job	Run time
create-splash-image	4s
collect-github-api-artifacts	12s
build-linux-dev	10m 5s
build-linux-user-ci	7m 23s
build-linux-dev-ci	12m 48s
build-linux-user	12m 49s
build-macos-dev	12m 51s
build-macos-user	12m 54s
build-linux-dev-hipe	9m 19s
build-macos-arm-dev	1s
build-macos-dev-hipe	12m 50s
build-macos-arm-dev-hipe	12m 46s
build-windows-dev-hipe	12m 46s
build-macos-arm-user	12m 51s
build-windows-dev	9m 25s
build-windows-user	12m 49s
create-release	0s
	2h 31m 53s

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