fix: the single_stable field of the show database statement is wrong

source/dnode/mnode/impl/src/mndDb.c

@@ -1550,10 +1550,8 @@ static void dumpDbInfoData(SSDataBlock *pBlock, SDbObj *pDb, SShowObj *pShow, in
     pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
     colDataAppend(pColInfo, rows, (const char *)t, false);
 
-    //  single stable model
-    int8_t m = 0;
     pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
-    colDataAppend(pColInfo, rows, (const char *)&m, false);
+    colDataAppend(pColInfo, rows, (const char *)&pDb->cfg.numOfStables, false);
 
     pColInfo = taosArrayGet(pBlock->pDataBlock, cols);
     colDataAppend(pColInfo, rows, (const char *)b, false);