Fixes to show-image page
@johnsond says: A couple minor things, both on the portal/show-image.php page, from helping Nasir this morning. First, can we have something that lets us unset (or re-set, I suppose) the architecture field, so that we can restrict the type list? Then second, there is a bug where if you have just unset the arch field in the DB, reloaded the page, no Types are set. So you set some, click the check mark, and then realize you missed a type and hit edit again (without reloading the page) -- then none of the types are checked. Now of course if I reload the page, and then edit the types, then I get the types I had previous set pre-selected, as I would expect. I'll leave it to you to decide if the extra state keeping is worth it