get rid of some more deprecated uses of $a

Zotlabs/Storage/Browser.php

@@ -257,7 +257,7 @@ class Browser extends DAV\Browser\Plugin {
 			}
 		}
 		$this->server->httpResponse->setHeader('Content-Security-Policy', "script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'");
-		construct_page($a);
+		construct_page();
 	}
 
 	/**