*much* more usage of App::get_baseurl() instead of $a->get_baseurl() (coding convention applied)

Signed-off-by: Roland Häder <roland@mxchange.org>

mod/opensearch.php

@@ -6,7 +6,7 @@
 		header("Content-type: application/opensearchdescription+xml");
 	
 		$o = replace_macros($tpl, array(
-			'$baseurl' => $a->get_baseurl(),
+			'$baseurl' => App::get_baseurl(),
 			'$nodename' => $a->get_hostname(),
 		));