Vertical Tabs: Prevent tabs from shifting in the opposite direction when closing tabs

[StrangePeanut]

Description

Title

Steps to Reproduce

1. Enable Vertical Tabs
2. Open a sufficient amount of tabs to enable scrolling
3. Scroll down the list of tabs
4. Close a tab

Actual result:

The list of tabs shifts in the opposite direction

BraveVerticalTabsExample01.mp4

Expected result:

The list of tabs remains in fixed position (with the next tab replacing the closed tab)

BraveVerticalTabsExample02.mp4

Reproduces how often:

Always

Brave version (brave://version info)

• 1.45.113 Chromium: 107.0.5304.62 (Official Build) (64-bit)
• 1.47.20 Chromium: 107.0.5304.68 (Official Build) nightly (64-bit)

Version/Channel Information:

• Can you reproduce this issue with the current release? Yes
• Can you reproduce this issue with the beta channel? Yes
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? No
• Does the issue resolve itself when disabling Brave Rewards? No
• Is the issue reproducible on the latest version of Chrome? No

Miscellaneous Information:

n/a

[StrangePeanut]

Related: #25883