main: GDK_SCALE is read once

Both popups read it, each just before its own textinit, and the second
copy needed a comment to say why it was there at all.  One frontend runs
per session and popupscale is one global, so threadmain reads it before it
starts either -- which is before any setfont, the only ordering the two
copies were keeping.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

win.c

@@ -197,11 +197,7 @@ wininit(void)
 	xcb_randr_query_version_cookie_t rc;
 	xcb_randr_query_version_reply_t *rr;
 	const xcb_query_extension_reply_t *rext;
-	char *scale;
 
-	scale = getenv("GDK_SCALE");
-	if(scale != nil && atoi(scale) > 1)
-		popupscale = min(atoi(scale), 4);
 	conn = xcb_connect(nil, &n);
 	if(xcb_connection_has_error(conn)){
 		fprint(2, "strans: popup disabled: cannot connect to X display\n");