refs #16396 * fixed bug that user network always lower

src/AjaxHandler/GetBoss.php

@@ -162,6 +162,7 @@ class GetBoss extends \VuFind\AjaxHandler\AbstractBase
                 $this->config->General->networks->toArray() : [];
             $addNetworks = isset($this->config->General->addNetworks) ?
                 $this->config->General->addNetworks->toArray() : [];
+            $network = strtolower($network);
             $inArray = in_array($network, $networks);
             $zdbId = $driver->tryMethod('getZdbId');
             $isbns = $driver->tryMethod('getISBNs');