make sure that fullscreen clients are on the correct screen when isfloating is true

Bug: https://github.com/djpohly/dwl/issues/487

dwl.c

@@ -2102,8 +2102,8 @@ setmon(Client *c, Monitor *m, uint32_t newtags)
 		/* Make sure window actually overlaps with the monitor */
 		resize(c, c->geom, 0);
 		c->tags = newtags ? newtags : m->tagset[m->seltags]; /* assign tags of target monitor */
-		setfullscreen(c, c->isfullscreen); /* This will call arrange(c->mon) */
 		setfloating(c, c->isfloating);
+		setfullscreen(c, c->isfullscreen); /* This will call arrange(c->mon) */
 	}
 	focusclient(focustop(selmon), 1);
 }