Replace $is_eligible_ByPartner by $is_eligible_ByAdmin

$is_eligible_ByPartner is undefined, this prevents updating a
verification.
Save verification if borrower is declined

Hence the name of the person completing the decline saved. See #9.
Prevent undefined notice
Fix radio selection (activate, interview or decline) in verification form

Remove the auto selection of the ‘interview’ button.
Fixes #9.
Merge pull request #47 from jonasdt/verification

Fix verification page issues