Fix window sizing craziness on Windows. Now to check Linux.
Change location of clearing updateClientBounds to make sure OnResize is executed when client rectangle is changed.
OpenTK, Linux and resizing windows
OpenTK on Linux currently does not allow the window to be resized if the border is fixed. We get the resize event for the intended size, then immediately get a resize event for the original size. This was preventing GraphicsDeviceManager.PreferredBackBufferWidth and PreferredBackBufferHeight from having any effect.
Previously reported to OpenTK here http://www.opentk.com/node/3132
Merge pull request #1480 from slygamer/window-size-fix

[Linux] Window size fix