[client] x11: change to a more visible "dot" cursor #2309

Job	Run time
host-windows-cross	51s
docs	1m 19s
host-linux	46s
client (gcc, g++, xdg-shell, Release)	1m 6s
client (gcc, g++, xdg-shell, Debug)	59s
client (gcc, g++, libdecor, Release)	1m 9s
client (gcc, g++, libdecor, Debug)	1m 9s
client (clang, clang++, xdg-shell, Release)	1m 26s
client (clang, clang++, xdg-shell, Debug)	1m 37s
client (clang, clang++, libdecor, Release)	1m 32s
client (clang, clang++, libdecor, Debug)	1m 30s
host-windows-native	1m 54s
module	15s
obs (gcc)	51s
obs (clang)	41s
	17m 5s

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