icons on course overview should no longer have the new extra, fixes #777

lib/classes/MyRealmModel.php

lib/modules/CoreDocuments.class.php

lib/modules/CoreElearningInterface.class.php

lib/modules/CoreOverview.class.php

lib/modules/CoreParticipants.class.php

lib/modules/CoreSchedule.class.php

lib/modules/CoreScm.class.php

lib/modules/CoreStudygroupParticipants.class.php

lib/modules/CoreWiki.class.php

lib/modules/GradebookModule.class.php

lib/modules/IliasInterfaceModule.class.php

lib/modules/LtiToolModule.class.php

public/plugins_packages/core/Blubber/Blubber.class.php

public/plugins_packages/core/Forum/CoreForum.class.php