Fix code left over from before StreamTeeLogger was not a Logger object, but had a logger attribute instead.
Fix code left over from before StreamTeeLogger was not a Logger object, but had a logger attribute instead.

git-svn-id: 6d9763a5a770351123389058c013888add577529@14127 fe389314-cf27-0410-b35b-8c050e845b92

spacetelescope/stsci.tools