more adaptation to new Solr config

lib/BookSearch.php

@@ -32,7 +32,7 @@ class BookSearch
     public function addQuery($queryText, $queryField = '')
     {
         if ($queryField != '')
-            $queryText = "$queryField:($queryText)";
+            $queryText = "$queryField:\"$queryText\"";
 
         $this->queryParts[] = $queryText;
     }

mobile.netbiblio.php

@@ -340,7 +340,7 @@ class NetBiblio extends WebService
             });
             if (count($selectedCategories) > 0) {
                 $selectedCategories = array_map(function ($c) {
-                    return "categorycode: $c";
+                    return "categoryCode: $c";
                 }, $selectedCategories);
                 $bs->addQuery('(' . implode(' OR ', $selectedCategories) . ')');
             }