refactor: adjust max vgroups per db

include/util/tdef.h

@@ -287,7 +287,7 @@ typedef enum ELogicConditionType {
 #define TSDB_MULTI_TABLEMETA_MAX_NUM 100000  // maximum batch size allowed to load table meta
 
 #define TSDB_MIN_VNODES_PER_DB          1
-#define TSDB_MAX_VNODES_PER_DB          4096
+#define TSDB_MAX_VNODES_PER_DB          1024
 #define TSDB_DEFAULT_VN_PER_DB          2
 #define TSDB_MIN_BUFFER_PER_VNODE       3      // unit MB
 #define TSDB_MAX_BUFFER_PER_VNODE       16384  // unit MB