Fix minimized windows being focused when a focused window is closed

[tarek-y-ismail]

Closes #3309

TODO:

• Alt + Tab not working
• Alt + tabbing between two minimized applications doesn't un-minimize them
  Open three windows, minimize the first two, close the third. Alt + tab between the two minimized windows.
  Expected: Both windows become un-minimized. Reality: Alt tabbing from a window re-minimizes it (or at least hides it)
• Minimized applications with decorations change their position and size when shown
  This occurred when testing the bug above, when repeatedly alt tabbing between windows (and thus hiding and showing them), I would see that they shifted slightly to the bottom right, with the window size gradually increasing.
• Following reproduction steps but minimizing the second app, focuses the (minimized) first app
• Fixing tests

[tarek-y-ismail]

I think mir_surface and scene_surface are both referring to the same thing?

mir/src/miral/basic_window_manager.cpp

Lines 1655 to 1658 in fa1e09b

	std::shared_ptr<scene::Surface> const& mir_surface = hint;
	if (info_for_hint.state() == mir_window_state_minimized)
	{
	std::shared_ptr<scene::Surface> const scene_surface{hint};