Removed unused WScreen argument in dock's drawer state functions

It was used to access the session state, which was stored in the
screen scruct, which is now more logically in the global namespace.

src/dock.c

@@ -4829,7 +4829,7 @@ finish:
 /* Same kind of comment than for previous function: this function is
  * very similar to make_icon_state, but has substential differences as
  * well. */
-static WMPropList *drawerSaveState(WScreen *scr, WDock *drawer)
+static WMPropList *drawerSaveState(WDock *drawer)
 {
 	WMPropList *pstr, *drawer_state;
 	WAppIcon *ai;
@@ -4884,7 +4884,7 @@ void wDrawersSaveState(WScreen *scr)
 	for (i=0, dc = scr->drawers;
 	     i < scr->drawer_count;
 	     i++, dc = dc->next) {
-		drawer_state = drawerSaveState(scr, dc->adrawer);
+		drawer_state = drawerSaveState(dc->adrawer);
 		WMAddToPLArray(all_drawers, drawer_state);
 		WMReleasePropList(drawer_state);
 	}