Remove excess parameter to g_app_info_launch()

Commit 39a840e2c3 added an additional parameter to shell_app_launch().
When adjusting callers, the parameter was also added accidentally to
calls of the confusingly similar g_app_info_launch() ...
Remove those to fix some warnings.

https://bugzilla.gnome.org/show_bug.cgi?id=781471

js/misc/util.js

@@ -97,7 +97,7 @@ function spawnApp(argv) {
                                                       Gio.AppInfoCreateFlags.SUPPORTS_STARTUP_NOTIFICATION);
 
         let context = global.create_app_launch_context(0, -1);
-        app.launch([], context, false);
+        app.launch([], context);
     } catch(err) {
         _handleSpawnError(argv[0], err);
     }