Don't update image model twice

The image model is updated through events from the edit dialog.
There is no need to update the states of the select/checkboxes
at the end in 'apply'. The only inputs that are not updated
on change are caption and alternate text.

Bug: 65564
Change-Id: I18c009546120e270467418cff677ec491fd109ca
Merge "Don't update image model twice"