Fix ub in KStandardAction::create
Fixes the following ubsan warning:
kstandardaction.h:243:64: runtime error: load of value 4294967295, which is not a valid value for type 'Qt::ConnectionType'
Fixes the following ubsan warning:
kstandardaction.h:243:64: runtime error: load of value 4294967295, which is not a valid value for type 'Qt::ConnectionType'