applied Lukas' focus suggestion at startup, thanks

dwm.c

@@ -1542,6 +1542,7 @@ setup(void) {
 	XChangeWindowAttributes(dpy, root, CWEventMask|CWCursor, &wa);
 	XSelectInput(dpy, root, wa.event_mask);
 	grabkeys();
+	focus(NULL);
 }
 
 void