Bugfix FXIOS-12496 [Tab tray UI experiment] Tabs' titles are incorrectly displayed in light theme

[lmarceau]

:scroll: Tickets

Jira ticket Github issue

:bulb: Description

Make sure theme is applied properly on tab title supplementary views

:pencil: Checklist

• [X] I filled in the ticket numbers and a description of my work
• [X] I updated the PR name to follow our PR naming guidelines
• [ ] I ensured unit tests pass and wrote tests for new code
• [ ] If working on UI, I checked and implemented accessibility (Dynamic Text and VoiceOver)
• [ ] If adding telemetry, I read the data stewardship requirements and will request a data review
• [ ] If needed, I updated documentation and added comments to complex code
• [X] If needed, I added a backport comment (example @Mergifyio backport release/v120)

[lmarceau]

@Mergifyio backport release/v140

[mergify[bot]]

backport release/v140

✅ Backports have been created

• #27368 Bugfix FXIOS-12496 [Tab tray UI experiment] Tabs' titles are incorrectly displayed in light theme (backport #27316) has been created for branch release/v140

[mobiletest-ci-bot]

	Messages
:book:	Project coverage: 36.58%
:book:	Edited 1 files
:book:	Created 0 files

Client.app: Coverage: 35.36

File	Coverage
TabDisplayView.swift	34.62%	⚠️

Generated by :no_entry_sign: Danger Swift against 1f3494afae4c131433f50ec616829d17911b9ab9