Unscrollable dialog boxes

[willow9886]

• From the menu on the left, choose "OpenID Connect", then "Clients",
  open a client, and then "Add scope".
• This opens a dialog box to search for scopes. Leave the search box
  empty, click "Search".
• The new dialog box is taller than my screen, can't be scrolled, and
  can't be moved so that the bottom of the dialog box becomes visible.

Attached is a screenshot.

This prevents users from easily being able to add scopes to clients. We
have a large number of scopes, and having to type them individually is
a bit of a chore.

This may be an issue in other screens as well.

[yurem]

Fixed: e0d9adf