Update expected UI screenshots for the restyled select [ignore_release]

[snake14]

Description

Updates the expected UI screenshots for the restyled select form field in matomo-org/matomo#25100, which brings uicontrol="select" in line with the expandable selects and the top-level selectors: a bordered, rounded control with a chevron instead of Materialize's underlined field.

Screenshots only — no plugin code changes, so no version bump or changelog entry. The images are the processed output of the core PR's own CI run, not locally generated.

Depends on matomo-org/matomo#25100. The UI tests here run against core 6.x-dev, which does not have the restyle yet, so this PR's UI check stays red until that merges. Re-running it afterwards should turn it green with no further changes.

Issue No

Related to matomo-org/matomo#25100

Steps to Replicate the Issue

1. Run the plugin's UI tests against core 6.x-dev with Restyle the standard select to match the design system matomo#25100 applied.
2. Expected: all specs pass.
3. Actual (without these updated screenshots): the specs listed in this diff fail on the restyled select, with the old underlined control in the expectation.

Checklist

• [✖] Tested locally or on demo2/demo3?
• [NA] 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?