Re-enables the fullscreen toggle. #46

Job	Run time
build (ubuntu-latest, Release, gcc)	3m 27s
build (ubuntu-latest, Release, clang)	2m 51s
build (ubuntu-latest, Release, mingw-w64-gcc)	2m 51s
build (ubuntu-latest, Debug, gcc)	2m 48s
build (ubuntu-latest, Debug, clang)	3m 20s
build (ubuntu-latest, Debug, mingw-w64-gcc)	2m 18s
build (windows-latest, Release, cl)	6m 3s
build (windows-latest, Debug, cl)	5m 2s
build (macos-latest, Release, gcc)	3m 45s
build (macos-latest, Release, clang)	3m 29s
build (macos-latest, Debug, gcc)	3m 50s
build (macos-latest, Debug, clang)	3m 32s
	43m 16s

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