issue #328: remove unused fontawesome icon map

lib.php

@@ -65,17 +65,6 @@ function auth_outage_get_climaintenance_resource_file($file) {
     return ($realpath == false) ? null : $realpath;
 }
 
-/**
- * Display required icon for the calendar events.
- *
- * @return array
- */
-function auth_outage_get_fontawesome_icon_map() {
-    return [
-        'core:i/auth_outageevent' => 'fa-power-off',
-    ];
-}
-
 /**
  * Inject the warning bar into the page if there is currently an outage.
  *