Wrong dark/bright icon version on settings

Steps to reproduce

1. Create a new external site
2. Set type to 'settings'
3. Open Nextcloud settings menu

Expected behaviour

Have an icon with the same color than the others.

Actual behaviour

The color is reverse

Server configuration

Operating system: Debian 11

Web server: Apache/2.4.54

Database: PostgreSQL 13.9

PHP version: PHP 7.4.33

Nextcloud version: Nextcloud 25.0.3

Where did you install Nextcloud from: On official nextcloud site, latest archive

List of activated apps:

• activity: 2.17.0
• cloud_federation_api: 1.8.0
• comments: 1.15.0
• dav: 1.24.0
• external: 5.0.2
• federatedfilesharing: 1.15.0
• files: 1.20.1
• files_pdfviewer: 2.6.0
• files_rightclick: 1.4.0
• files_sharing: 1.17.0
• files_trashbin: 1.15.0
• files_versions: 1.18.0
• groupfolders: 13.1.1
• lookup_server_connector: 1.13.0
• oauth2: 1.13.0
• ownpad: 0.7.1
• provisioning_api: 1.15.0
• settings: 1.7.0
• sociallogin: 5.4.1
• theming: 2.0.1
• twofactor_backupcodes: 1.14.0
• viewer: 1.9.0
• workflowengine: 2.7.0

Nextcloud configuration:
"system": {
"social_login_auto_redirect": false,
"allow_local_remote_servers": true,
"passwordsalt": "REMOVED SENSITIVE VALUE",
"secret": "REMOVED SENSITIVE VALUE",
"trusted_domains": [
"infrasso.zapto.org"
],
"trusted_proxies": "REMOVED SENSITIVE VALUE",
"overwriteprotocol": "https",
"datadirectory": "REMOVED SENSITIVE VALUE",
"dbtype": "pgsql",
"version": "25.0.3.2",
"overwrite.cli.url": "http://localhost",
"dbname": "REMOVED SENSITIVE VALUE",
"dbhost": "REMOVED SENSITIVE VALUE",
"dbport": "",
"dbtableprefix": "oc_",
"dbuser": "REMOVED SENSITIVE VALUE",
"dbpassword": "REMOVED SENSITIVE VALUE",
"installed": true,
"instanceid": "REMOVED SENSITIVE VALUE",
"allow_user_to_change_display_name": false,
"lost_password_link": "disabled"
}

Client configuration

Browser: Firefox 110.0

Operating system: Ubuntu 22.04

Logs

Nextcloud log (data/owncloud.log)

No log

Browser log

Console log
Network log

Start by reproducing the external site with type "settings" and opening the Nextcloud settings menu. Inspect the browser console and network logs linked in the issue, then trace the icon selection used there; done means the settings icon uses the same color version as the surrounding icons.