Let KWin handle the decoration defaults
Empty means default, we do not need any logic to get the correct default here, KWin knows the best what to do. See also the other config keys BUG:429298 FIXED-IN:5.20.4
Empty means default, we do not need any logic to get the correct default here, KWin knows the best what to do. See also the other config keys BUG:429298 FIXED-IN:5.20.4