Remove depthFirst parameter from WMTreeWalk.

WMTreeWalk is only called once, with depthFirst set to true, so we might as well
just hard-code that behavior.

Also, this parameter appears to have been misnamed (since the search is always DFS)
and should properly be named to indicate that it controls if this is a pre- or
post-order traversal.

util/wmmenugen.c

@@ -178,7 +178,7 @@ int main(int argc, char **argv)
 	}
 
 	WMSortTree(menu, menuSortFunc);
-	WMTreeWalk(menu, assemblePLMenuFunc, previousDepth, True);
+	WMTreeWalk(menu, assemblePLMenuFunc, previousDepth);
 
 	i = WMGetArrayItemCount(plMenuNodes);
 	if (i > 2) { /* more than one submenu unprocessed is almost certainly an error */