MDL-73233 moodlenet: Change cancel link to /

The cancel link when content is imported from MoodleNet has
been changed from /my to /, in order to get it working always,
regardless the $CFG->enabledashboard setting is enabled or not.

admin/tool/moodlenet/classes/output/select_page.php

@@ -70,7 +70,7 @@ class select_page implements \renderable, \templatable {
         return (object) [
             'name' => $this->importinfo->get_resource()->get_name(),
             'type' => $this->importinfo->get_config()->type,
-            'cancellink' => new \moodle_url('/my'),
+            'cancellink' => new \moodle_url('/'),
         ];
     }
 }