Disabled ios-sfml-graphics CI job was still being referenced #601

Job	Run time
ios-sdl	3m 11s
android-sdl	5m 15s
linux	5m 18s
android-sfml-graphics	2m 11s
linux-latest-dev	4m 57s
linux-oldest	2m 53s
linux-per-backend	4m 27s
macos	7m 22s
windows-clang	5m 10s
windows-oldest	6m 6s
windows-sfml-sdl	2m 36s
windows-static-mt	5m 3s
nightly-build-windows-visual-studio	6m 47s
	1h 1m 16s

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