Option to show full app_id in window switcher

It is now possible to specify whether to show full application
identifier or the trimmed variant in window switcher OSD.

src/osd.c

@@ -44,6 +44,9 @@ get_formatted_app_id(struct view *view)
 	if (!s) {
 		return NULL;
 	}
+	if (rc.window_switcher.full_app_id) {
+		return s;
+	}
 	/* remove the first two nodes of 'org.' strings */
 	if (!strncmp(s, "org.", 4)) {
 		char *p = s + 4;