fix: stale statusbar when started in thumbnail mode (#341)

this was one of the cases which got missed in 591be8c, if someone starts
with `-t` the statusbar will remain at "Loading ...". Once we're done
loading all the thumbnail, make sure to open_info() so that `thumb-info`
gets called.

Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/341
Reviewed-by: explosion-mental <explosion-mental@noreply.codeberg.org>

main.c

@@ -720,8 +720,10 @@ static void run(void)
 					remove_file(tns.loadnext, false);
 					tns.dirty = true;
 				}
-				if (tns.loadnext >= tns.end)
+				if (tns.loadnext >= tns.end) {
+					open_info();
 					redraw();
+				}
 			} else if (init_thumb) {
 				set_timeout(redraw, TO_REDRAW_THUMBS, false);
 				if (!tns_load(&tns, tns.initnext, false, true))