Remove assumption on DISPLAY value

Could be :1 or more, explicitly providing it seems only useful from outside the actual X session

dotfiles/eecc/dmenu.ini

@@ -4,8 +4,8 @@
     MOVING      = eeiam moving
     BACK        = eeiam back
 
-    kb:us       = DISPLAY=:0 setxkbmap us
-    kb:cz       = DISPLAY=:0 setxkbmap cz
+    kb:us       = setxkbmap us
+    kb:cz       = setxkbmap cz
 
     ff          = firefox
     ipython     = urxvt -e ipython