Fixed Bug on "delistaccountforsale" JSON-RCP method

Found by Rabarbers
https://discord.com/channels/383064643482025984/383197628692955138/822279682962489414

src/core/URPC.pas

@@ -2434,7 +2434,7 @@ function TRPCProcess.ProcessMethod(const method: String; params: TPCJSONObject;
         OperationsHashTree.Free;
       end;
     finally
-      FNode.OperationSequenceLock.Acquire;
+      FNode.OperationSequenceLock.Release;
     end;
   End;