Remove scheduleRedraw() method leftover

The scheduleRedraw() method was removed by the commit
076673dfe3d967e42c8d92b08165e2ac0e166b9b but it was left in
the header.

Change-Id: Ia7bc8aa4c749c1542174132d39c381d38105791e
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
Use requested window format

Otherwise we end up with errors like this:

  QEGLPlatformContext::makeCurrent: eglError: 3009, this: 0x4b5c58

Change-Id: I6c44ee67c9049469088c5848df463a21e2bd2c66
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>