Fix typo leading to false VERIFY (#1220)

Author: alexvru

ydb/core/blobstorage/nodewarden/group_stat_aggregator.h

@@ -53,7 +53,7 @@ namespace NKikimr {
         Y_ABORT_UNLESS(vdiskServiceId.IsService());
         char x[12];
         TStringBuf serviceId = vdiskServiceId.ServiceId();
-        Y_VERIFY_S(serviceId[0] == 'b' && serviceId[1] == 's' && serviceId[2] == 'v' && serviceId[3] != 'd',
+        Y_VERIFY_S(serviceId[0] == 'b' && serviceId[1] == 's' && serviceId[2] == 'v' && serviceId[3] == 'd',
                 "Invalid VDisk's, HexEncode(ServiceId)# " << HexEncode(serviceId));
         memcpy(x, serviceId.data(), serviceId.size());
         x[0] = 'b';