[Vertical Tabs] Tabs inside groups have an incorrect right margin/empty space on the right side #58010

Description

When using vertical tabs, the tabs that are inside groups have an extra empty space to the right that shouoldn't be there, making them shorter than the other non-grouped tabs. This is more noticeable when using the collapsed mode.

Steps to reproduce

1. Enable vertical tabs
2. Create a new group with tabs inside
3. See how the tab is less wide than the other tabs

Actual result

Expected result

Reproduces how often

Easily reproduced

Brave version (brave://version info)

1.95.47 Chromium: 151.0.7922.83 (Official Build) nightly (arm64)

Channel information

• release (stable)
• beta
• nightly

Reproducibility

• with Brave Shields disabled
• with Brave Rewards disabled
• in the latest version of Chrome

Miscellaneous information

No response