Fix merger

Author: robdrynkin

ydb/core/blobstorage/vdisk/balance/balancing_actor.cpp

@@ -145,6 +145,7 @@ namespace NBalancing {
                     continue;
                 }
 
+                merger.Clear();
                 It.PutToMerger(&merger);
 
                 auto [moveMask, delMask] = merger.Ingress.HandoffParts(&top, Ctx->VCtx->ShortSelfVDisk, key);
@@ -183,8 +184,6 @@ namespace NBalancing {
                     }
                 }
 
-                merger.Clear();
-
                 if (SendOnMainParts.Size() >= Ctx->Cfg.MaxToSendPerEpoch && TryDeleteParts.Size() >= Ctx->Cfg.MaxToDeletePerEpoch) {
                     // reached the limit of parts to send and delete
                     break;

ydb/core/blobstorage/vdisk/balance/utils.cpp

@@ -78,7 +78,6 @@ namespace NBalancing {
     void TPartsCollectorMerger::Clear() {
         Ingress = TIngress();
         Parts.clear();
-        Parts.resize(GType.TotalPartCount());
     }
 
 } // NBalancing