Replace MSVC __debugbreak with cross-compiler DEBUG_BREAK macro. (#1540)

Minecraft.Client/Xbox/Network/PlatformNetworkManagerXbox.cpp

@@ -211,8 +211,6 @@ VOID CPlatformNetworkManagerXbox::NotifyPlayerLeaving(
 	__in IQNetPlayer *              pQNetPlayer
 	)
 {
-	//__debugbreak();
-
 	app.DebugPrintf( "Player 0x%p \"%ls\" leaving.\n",
         pQNetPlayer,
         pQNetPlayer->GetGamertag() );