refs #19311 [finc] remove _ from call of getLiberoDingRequestHeaders method

* caused ajax errors

module/finc/src/finc/ILS/Driver/LiberoDingTrait.php

@@ -757,7 +757,7 @@ trait LiberoDingTrait
                 $this->getWebScraperUrl() . 'getMyLoanHistory.jsp',
                 $params,
                 null,
-                $this->_getLiberoDingRequestHeaders()
+                $this->getLiberoDingRequestHeaders()
             );
         } catch (\Exception $e) {
             throw new ILSException($e->getMessage());