support no-unified global shortcuts

--v0.8 introduced unified global shortcuts for all
cases, that means that applets are also taken into
account for Latte activation/new instance global
shortcuts. A new parameter is introduced with
the patch at Latte global settings file called
"unifiedGlobalShortcuts", the user can set that
parameter to false before Latte startup in order
to use only global shortcuts relevant to the
Latte plasmoid.