x11.c: fix root wm detection
x11.c: fix root wm detection

scarabeusiv/wlc,UIKit0/wlc,lkundrak/wlc,yohanesu75/wlc,Enerccio/ewlc,vially/wlc,Enerccio/ewlc,Cloudef/wlc,Earnestly/wlc,gpyh/wlc,vially/wlc,gpyh/wlc,ammen99/wlc,Earnestly/wlc,UIKit0/wlc,SirCmpwn/wlc,scarabeusiv/wlc,yohanesu75/wlc,ss1h2a3tw/wlc,ammen99/wlc,ss1h2a3tw/wlc,SirCmpwn/wlc,lkundrak/wlc,Cloudef/wlc