lxqt-config-monitor: Correct loadsettings.cpp
lxqt-config-monitor: Correct loadsettings.cpp

- use QCoreApplication::exit() rather than forcing (unclean) shutdown by
::exit()
- includes clean-up

lxde/lxqt-config,lxde/lxqt-config,lxde/lxqt-config,stefonarch/lxqt-config,stefonarch/lxqt-config,stefonarch/lxqt-config,lxde/lxqt-config