build

[client] x11: fix typo #2431

Job	Run time
docs	33s
client (gcc, g++, xdg-shell, Release)	50s
host-linux	41s
host-windows-cross	36s
host-windows-native	1m 22s
client (gcc, g++, xdg-shell, Debug)	40s
client (gcc, g++, libdecor, Release)	1m 4s
module	24s
client (gcc, g++, libdecor, Debug)	1m 0s
obs (gcc)	27s
client (clang, clang++, xdg-shell, Release)	1m 2s
obs (clang)	35s
client (clang, clang++, xdg-shell, Debug)	57s
client (clang, clang++, libdecor, Release)	1m 26s
client (clang, clang++, libdecor, Debug)	51s
	12m 28s

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