update expected result after r27798

git-svn-id: https://svn.osgeo.org/gdal/trunk@27799 f0d54148-0727-0410-94bb-9a71ac55c965
Add other tests for warping, including downsampling of lanczos and cubicspline

git-svn-id: https://svn.osgeo.org/gdal/trunk@27800 f0d54148-0727-0410-94bb-9a71ac55c965