[host] dxgi: enable 24-bit mode by default #2435

Job	Run time
host-windows-cross	44s
docs	39s
host-linux	32s
client (gcc, g++, xdg-shell, Release)	1m 1s
host-windows-native	1m 25s
client (gcc, g++, xdg-shell, Debug)	51s
module	22s
obs (gcc)	27s
client (gcc, g++, libdecor, Release)	46s
obs (clang)	38s
client (gcc, g++, libdecor, Debug)	49s
client (clang, clang++, xdg-shell, Release)	1m 16s
client (clang, clang++, xdg-shell, Debug)	41s
client (clang, clang++, libdecor, Release)	1m 16s
client (clang, clang++, libdecor, Debug)	1m 3s
	12m 30s

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