MDEV-11856 json_search doesn't search for values with double quotes

character (").

        The my_wildcmp function doesn't expect the string parameter to
        have escapements, only the template. So the string
        should be unescaped if necessary.

sql/item_jsonfunc.h

@@ -392,7 +392,7 @@ public:
 class Item_func_json_search: public Item_json_str_multipath
 {
 protected:
-  String tmp_js;
+  String tmp_js, esc_value;
   bool mode_one;
   bool ooa_constant, ooa_parsed;
   int escape;