Timeline cells have only 1 line for title

[pyby]

Issue type

Incorrect behavior

Description of the problem

In previous version (1.15.0), a timeline cell had 2 lines for the title. In the current version 3.0.0, we only see one line.

Environment information

• Library version: 2.0.0 and more
• iOS version: Any
• Device: Any

Reproducibility

Always reproducible

Steps to reproduce

1. Find an example with a timeline, like "RTS VOD (segments)".
2. Play it and tap to display controls and the timeline.

[pyby]

With Letterbox 2.0.0 release, SRGAppearance was updated to 2.0.0 . It includes a SRG SSR font update.

This new SRG SSR font is 1 pixel higher.

To display two lines for a timeline cell title, 2 propositions:

• Change SRGLetterboxViewDefaultTimelineHeight from 120.f to 122.f.
• Adapt top and bottom constraint layouts on the title label and get 2 more pixels (@1x) for height.

feature/timeline-label implements the second proposition. 1 point on top and 1 on bottom to keep the same vertical alignement.