apply hints before initial mapping (ICCCM)

For WM_CLASS this is mentioned in the ICCCM docs
https://tronche.com/gui/x/icccm/sec-4.html#s-4.1.2.5
(third sentence).

When changing the WM_CLASS from the command line, this is necessary for
window managers to pick it up before applying class-based rules.

x.c

@@ -1154,8 +1154,8 @@ xinit(int cols, int rows)
 
 	win.mode = MODE_NUMLOCK;
 	resettitle();
-	XMapWindow(xw.dpy, xw.win);
 	xhints();
+	XMapWindow(xw.dpy, xw.win);
 	XSync(xw.dpy, False);
 
 	clock_gettime(CLOCK_MONOTONIC, &xsel.tclick1);