Fixing SynchronizeWithVerticalRetrace on WindowsGL, it is applied in ApplyChanges instead of immediately (which fails if set in Game constructor)
Remove VSyncEnabled as it is just overwriting what we set from GetSwapInterval. It was only used by the OpenTK Platform.
Merge pull request #2480 from danzel/fix-1862

Make disabling SynchronizeWithVerticalRetrace work on WindowsGL