OpenedSessionsNoSendBuf counter

(cherry picked from commit ee9ef8051fb18d1c704493770a399d985dc82bc9)

Source commit: d70ff53bedd949f66222ca9bb9d0acf5631ae3b4

source/core/Terminal.cpp

@@ -7816,6 +7816,11 @@ void __fastcall TTerminal::CollectUsage()
     Configuration->Usage->Inc(L"OpenedSessionsEncrypted");
   }
 
+  if (SessionData->SendBuf == 0)
+  {
+    Configuration->Usage->Inc(L"OpenedSessionsNoSendBuf");
+  }
+
   FCollectFileSystemUsage = true;
 }
 //---------------------------------------------------------------------------