wined3d: Properly handle WS_VISIBLE and WS_EX_TOPMOST style flags on fullscreen windows.

[Sam Edwards]

Note that the tests are NOT (primarily) intended to make sure that 
WS_VISIBLE and WS_EX_TOPMOST are still set. The main purpose of this 
patch is to fix a slightly more serious bug:

- Create a window without WS_VISIBLE.
- Create a fullscreen Direct3D device.
- wined3d applies its own flags (including WS_VISIBLE) to the window, to 
make it fullscreen.
- Reset the device back to windowed mode.
- Because wined3d_device_setup_fullscreen_window didn't see the window 
had WS_VISIBLE, wined3d_device_restore_fullscreen_window won't restore 
the style.

This patch corrects that behavior, and the window restores back to its 
original style as on Windows.
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