[HOTFIX] [#1427] Fixed `:admin` option handling in OAuthScopesPlug, added tests

Closes #1427 (closed)

Follow-up to !2025 (merged)

mentioned in merge request !2025 (merged)

changed title from [#1427 (closed)] Fixed :admin option handling in OAuthScopesPlug, added tests to [HOTFIX] [#1427 (closed)] Fixed :admin option handling in OAuthScopesPlug, added tests

changed the description

merged

mentioned in commit 1f498ba2

mentioned in merge request admin-fe!69 (merged)