Change event hooked for PostgreSQL bytea initialization.

- Fixes VUFIND-1214.

module/VuFind/src/VuFind/Db/Table/Search.php

@@ -72,7 +72,7 @@ class Search extends Gateway
             }
             $eventFeature = new Feature\EventFeature();
             $eventFeature->getEventManager()->attach(
-                Feature\EventFeature::EVENT_PRE_INSERT, [$this, 'onPreInsert']
+                Feature\EventFeature::EVENT_PRE_INITIALIZE, [$this, 'onPreInsert']
             );
             $this->featureSet->addFeature($eventFeature);
         }
@@ -81,7 +81,7 @@ class Search extends Gateway
     }
 
     /**
-     * Customize the Insert object to include extra metadata about the
+     * Customize the database object to include extra metadata about the
      * search_object field so that it will be written correctly. This is
      * triggered only when we're interacting with PostgreSQL; MySQL works fine
      * without the extra hint.