[OAuth] Application form missing algorithm field

The field to select the OIDC algorithm to use has vanished from the application form, probably when it was refactored.

added part::frontend type::bug labels

assigned to @hansegucker

created merge request !798 (merged) to address this issue

mentioned in merge request !798 (merged)

assigned to @nik and unassigned @hansegucker

closed with merge request !798 (merged)

mentioned in commit 0cc5a6dd