Parameters of removed item preprocessing steps are not removed from cache

Index: src/libs/zbxdbcache/dbconfig.c
===================================================================
--- src/libs/zbxdbcache/dbconfig.c      (revision 85639)
+++ src/libs/zbxdbcache/dbconfig.c      (working copy)
@@ -4363,6 +4363,7 @@
                        }
                }
 
+               zbx_strpool_release(op->params);
                zbx_hashset_remove_direct(&config->preprocops, op);
        }