JP2KAK: fix bug in vsil_target::end_rewrite() that prevented TLM index to be generated (#5585, patch by plroit)

git-svn-id: https://svn.osgeo.org/gdal/trunk@27541 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_travis_macosx