chore(dav): Remove dead \OCA\DAV\Server::getSabreServer

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

apps/dav/lib/Server.php

@@ -386,7 +386,4 @@ class Server {
 		return false;
 	}
 
-	public function getSabreServer(): Connector\Sabre\Server {
-		return $this->server;
-	}
 }