Use WM_CLASS class instead of instance
Use WM_CLASS class instead of instance

Usually the second part of WM_CLASS (the actual window class) is
expected (compare to i3wm class property) so we use this one.

If class property only holds one value, use it.

Cloudef/wlc,yohanesu75/wlc,yohanesu75/wlc,Enerccio/ewlc,Enerccio/ewlc,vially/wlc,vially/wlc,Cloudef/wlc