[host] dxgi: correct 24-bit packed output height calculation bug #2438

Job	Run time
host-windows-cross	36s
host-linux	46s
docs	37s
client (gcc, g++, xdg-shell, Release)	55s
client (gcc, g++, xdg-shell, Debug)	51s
host-windows-native	1m 38s
client (gcc, g++, libdecor, Release)	54s
module	24s
client (gcc, g++, libdecor, Debug)	1m 37s
obs (gcc)	49s
client (clang, clang++, xdg-shell, Release)	1m 8s
obs (clang)	28s
client (clang, clang++, xdg-shell, Debug)	1m 20s
client (clang, clang++, libdecor, Release)	55s
client (clang, clang++, libdecor, Debug)	1m 0s
	13m 58s

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