Allow .tpl files to be editable in File Manager (#3148)

* Allow .tpl files to be editable in File Manager

* Make Prettier happy

Co-authored-by: Jaap Marcus <9754650+jaapmarcus@users.noreply.github.com>

install/deb/filemanager/filegator/configuration.php

@@ -28,6 +28,7 @@ $dist_config["frontend_config"]["editable"] = [
 	".example",
 	".htaccess",
 	".twig",
+	".tpl",
 ];
 $dist_config["frontend_config"]["guest_redirection"] = "/login/";
 $dist_config["frontend_config"]["upload_max_size"] = 1024 * 1024 * 1024;