Use a link to accept orphan requests

Use a link to accept orphan requests

Currently, a form is used instead of a link. This forwards to a
confirmation page, and currently drops the "via" parameter in the
process.

As a result, accepted orphan requests usually show:

    Request #XXXXXX has been accepted automatically by the Arch User
    Repository package request system:

    The user YYYYYYY disowned the package.

This is wrong, and should show (will show, if you manually add it or use
the close button instead of the accept button):

    Request #XXXXXX has been rejected by YYYYYYY [1]:

Fixes FS#56606.

Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>