Fixed win32 issue with Fullscreen to Window retaining HWND_TOPMOST.
HWND_NOTOPMOST used to set as highest non top window, and removed SWP_NOZORDER to ensure the HWND_NOTOPMOST parameter is used.
Merge pull request #335 from dougbinks/HWND_NOTOPMOST

Fixed Win32 full screen window retaining HWND_TOPMOST.