Improve control on custom icon display on login page

[weilai-irl]

No description provided.

[Copilot]

Pull request overview

Adds admin control over whether the OpenID Connect provider icon (including custom icon uploads) is shown on the Moodle login page, and improves settings UX by conditionally hiding logout endpoint configuration when single sign-out is disabled.

Changes:

• Added a new admin checkbox to control whether an icon is shown on the login page, and conditionally hides the icon/custom icon settings when disabled.
• Updated the authcode login flow to respect the new “show icon” config.
• Hid the IdP logout endpoint setting unless single sign-out is enabled.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
auth/oidc/settings.php	Adds the new “show icon” checkbox and hide/show rules for icon-related settings; hides logout URI when SSO-off is disabled.
auth/oidc/lang/en/auth_oidc.php	Adds the language string for the new checkbox label.
auth/oidc/classes/loginflow/authcode.php	Implements runtime behavior change to show/hide icons based on the new config.

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