[BUG] Repeater tabs are resized when using custom theme

[sv3nbeast]

Describe the bug
When using Burp Customizer, Repeater tabs are much wider than without Burp Customizer. This may waste additional unnecessary space in the UI.

To Reproduce
Steps to reproduce the behavior:

1. Set a theme in Burp Customizer
2. Go to the "Repeater" tab.
3. See that the repeater tabs are much wider than usual.

Expected behavior
The repeater tabs should be smaller and more space efficient

Screenshots
before:

after:

Versions (please complete the following information):

• OS: All
• Burp Suite Pro / Community: Both
• Burp Suite Version [e.g. 2020.12]: 2020.12