Patch from Tim Mayberry:

Patch from Tim Mayberry:

Remove redundant init and cleanup code from common test code

Calling PBD::EnumWriter::destroy means ARDOUR::init and setup_libpbd_enums need to be called again
to register types. If the call to EnumWriter::destroy is removed then ARDOUR::init and setup_libpbd_enums
no longer need to be called. EnumWriter::destroy should probably be added to ARDOUR::cleanup(or better yet PBD::cleanup)
and then called at the end of main. __attribute__ ((destructor)) could be used but that is not portable between

git-svn-id: svn://localhost/ardour2/branches/3.0@12578 d708f5d6-7413-0410-9779-e7cbd77b26cf