lxqt-session: Use the base name to compare Wm's names
lxqt-session: Use the base name to compare Wm's names

mWindowManager can be the full path in some situations.
Closes lxde/lxqt#1073

lxde/lxqt-session,stefonarch/lxqt-session,stefonarch/lxqt-session,lxde/lxqt-session,stefonarch/lxqt-session,lxde/lxqt-session