IcingaObject(Legacy): Make getLegacyObjectType public

refs #12919

library/Director/Objects/IcingaCommand.php

@@ -177,7 +177,7 @@ class IcingaCommand extends IcingaObject
         self::$pluginDir = $pluginDir;
     }
 
-    protected function getLegacyObjectType()
+    public function getLegacyObjectType()
     {
         // there is only one type of command in Icinga 1.x
         return 'command';

library/Director/Objects/IcingaObject.php

@@ -1955,7 +1955,7 @@ abstract class IcingaObject extends DbObject implements IcingaConfigRenderer
         );
     }
 
-    protected function getLegacyObjectType()
+    public function getLegacyObjectType()
     {
         return strtolower($this->getType());
     }