Decrease the size of the branch picker icon (#32387)

<img width="323" alt="image"
src="https://github.com/user-attachments/assets/0060eaf3-35f9-4f0f-b9b6-e26ffad853c2"
/>

<img width="323" alt="image"
src="https://github.com/user-attachments/assets/57b66dae-2a74-401f-82c1-8fc730a98fb0
" />

Release Notes:

- Adjusted size of the icon inside the title bar's branch picker when
that's turned on.
047a7f5d29Ben Hamment committed on 6/9/2025, 2:08:53 PM· committed by GitHubparent8332e60
1 file changedLine totals unavailable