Ensured output from Describe >One variable >Frequencies dialog is correct

[anastasia-mbithe]

Fixes partially #8104

@rdstern, @Patowhiz and @lloyddewit
I have implemented the new output system in this dialog.

1. I have disabled the Both option since the new output system does not support producing two objects simultaneously. From the discussion with @Patowhiz, it's so easy for a user to go back and produce the other object when needed.
2. The dialog uses only one save control now.
3. The panel that initially controlled save as text(viewer) or HTML (browser) now controls save as a table and save as a data frame, for the Table option.

[lloyddewit]

@berylwaswa please could you test? thanks

[berylwaswa]

@lloyddewit @anastasia-mbithe this looks good.
The Both option has been disabled and it's easy to go back and produce the other object.
The dialog uses only one save control.