099d862 iso-dialog: Move type definitions from header to source file

Authored and Committed by etrunko 3 years ago
    iso-dialog: Move type definitions from header to source file
    
    There is no reason for this object to define a private structure, so it
    is fine to make everything private to the dialog itself.
    
    Signed-off-by: Eduardo Lima (Etrunko) <etrunko@redhat.com>