Remove `-x` bash argument from delta.test.
Remove `-x` bash argument from delta.test.

This makes the output much less noisy and consistent with the other tests.

librsync/librsync,dbaarda/librsync,dbaarda/librsync,sourcefrog/librsync,dbaarda/librsync,dbaarda/librsync,librsync/librsync,librsync/librsync,librsync/librsync,sourcefrog/librsync,sourcefrog/librsync,sourcefrog/librsync