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/ui/components/autorunManager.js

@@ -63,8 +63,7 @@ function startAppForMount(app, mount) {
 
     try {
         retval = app.launch(files, 
-                            global.create_app_launch_context(0, -1),
-                            false)
+                            global.create_app_launch_context(0, -1));
     } catch (e) {
         log('Unable to launch the application ' + app.get_name()
             + ': ' + e.toString());