correct previlige check for show vnodes/show connections cmd

src/mnode/src/mnodeDnode.c

@@ -1177,8 +1177,8 @@ static int32_t mnodeGetVnodeMeta(STableMetaMsg *pMeta, SShowObj *pShow, void *pC
   int32_t cols = 0;
   SUserObj *pUser = mnodeGetUserFromConn(pConn);
   if (pUser == NULL) return 0;
-  
-  if (strcmp(pUser->user, TSDB_DEFAULT_USER) != 0)  {
+
+  if (strcmp(pUser->pAcct->user, TSDB_DEFAULT_USER) != 0 ) {
     mnodeDecUserRef(pUser);
     return TSDB_CODE_MND_NO_RIGHTS;
   }

src/mnode/src/mnodeProfile.c

@@ -166,7 +166,7 @@ static void mnodeCancelGetNextConn(void *pIter) {
 static int32_t mnodeGetConnsMeta(STableMetaMsg *pMeta, SShowObj *pShow, void *pConn) {
   SUserObj *pUser = mnodeGetUserFromConn(pConn);
   if (pUser == NULL) return 0;
-  if (strcmp(pUser->user, TSDB_DEFAULT_USER) != 0) return TSDB_CODE_MND_NO_RIGHTS;
+  if (strcmp(pUser->pAcct->user, TSDB_DEFAULT_USER) != 0) return TSDB_CODE_MND_NO_RIGHTS;
   
   int32_t cols = 0;
   SSchema *pSchema = pMeta->schema;