fix compile error

src/inc/taosmsg.h

@@ -501,7 +501,7 @@ typedef struct {
 } SVnodeLoad;
 
 typedef struct {
-  char     db[TSDB_USERID_LEN + TSDB_DB_NAME_LEN];
+  char     db[TSDB_ACCT_LEN + TSDB_DB_NAME_LEN];
   int32_t  cacheBlockSize; //MB
   int32_t  totalBlocks;
   int32_t  maxTables;

src/mnode/inc/mnodeDef.h

@@ -154,7 +154,7 @@ typedef struct {
 } SDbCfg;
 
 typedef struct SDbObj {
-  char    name[TSDB_USERID_LEN + TSDB_DB_NAME_LEN];
+  char    name[TSDB_ACCT_LEN + TSDB_DB_NAME_LEN];
   char    acct[TSDB_USER_LEN];
   int64_t createdTime;
   int32_t cfgVersion;