Custom campaigns list: redraw parent as we use it's background

This one fix issue 2057

client/CPreGame.cpp

@@ -1213,6 +1213,7 @@ SelectionTab::SelectionTab(CMenuScreen::EState Type, const std::function<void(CM
 	else
 	{
 		bg = nullptr; //use background from parent
+		type |= REDRAW_PARENT; // we use parent background so we need to make sure it's will be redrawn too
 		pos.w = parent->pos.w;
 		pos.h = parent->pos.h;
 		pos.x += 3; pos.y += 6;