test-gapplication: Untabify, add modeline

tests/interactive/gapplication.js

@@ -1,4 +1,5 @@
 #!/usr/bin/env gjs
+// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
 
 const Gdk = imports.gi.Gdk;
 const Gio = imports.gi.Gio;
@@ -92,7 +93,6 @@ function main() {
 
     app.connect_after('startup', function(app) {
         app.set_app_menu(menu);
-
         window = new Gtk.ApplicationWindow({ title: "Test Application", application: app });
     });
     app.connect('activate', function(app) {