Update expected UI screenshots for the core select restyle [ignore_release]

[snake14]

Description

Matomo core PR matomo-org/matomo#25100 restyles the standard select as a bordered, rounded control with a chevron, replacing Materialize's underlined field. That changes how the backend and sentinel selects on the settings page render, so the 3 expected UI screenshots in this plugin no longer match.

This syncs those screenshots from CI on the core PR. There is no code change — the plugin's own styling needed no adjustment.

This cannot be merged before matomo-org/matomo#25100 — the screenshots only match once the core CSS is in, and that PR currently pins this plugin to this branch.

Issue No

Related to matomo-org/matomo#25100

Steps to Replicate the Issue

1. Open Administration > System > General settings and find the Queued Tracking section.
2. Expected: the selects render as the bordered, rounded control used elsewhere in Matomo 6.
3. Actual (before core#25100): they render as Materialize's underlined field with a triangle caret.

Checklist

• [✔] Tested locally or on demo2/demo3?
• [✔] New test case added/updated?
• [NA] Are all newly added texts included via translation?
• [NA] Are text sanitized properly? (Eg use of v-text v/s v-html for vue)
• [NA] Version bumped?
• [✔] I have understood, reviewed, and tested all AI outputs before use
• [✔] All AI instructions respect security, IP, and privacy rules
• [NA] Documentation updated?