Lower logo resolution to avoid aliasing on low-dpi screens (#2848)

### What

Has now the same vertical resolution as the R menu icon

---
Before on low-dpi (windows):

![before](https://github.com/rerun-io/rerun/assets/1220815/74ea8492-59ea-47d6-9b3f-fead9c241057)

After on low-dpi (windows):

![after](https://github.com/rerun-io/rerun/assets/1220815/647619fc-9019-4ae3-9247-da1682550c19)

---

Before on low-dpi (mac):

![image](https://github.com/rerun-io/rerun/assets/1220815/f1697961-078e-4119-85ec-ea13b583ffab)

After on low-dpi (mac):

![after](https://github.com/rerun-io/rerun/assets/1220815/17828c4e-f6c3-46dc-b881-20af38e6979b)

---

Before on high-dpi (mac):
<img width="245" alt="image"
src="https://github.com/rerun-io/rerun/assets/1220815/8b1179b1-3a28-44db-af19-a86882c085d3">

After on high-dpi (mac):
<img width="211" alt="image"
src="https://github.com/rerun-io/rerun/assets/1220815/2f08e7ab-21c7-41da-90e8-75abbac5e245">

### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [x] I've included a screenshot or gif (if applicable)
* [x] I have tested [demo.rerun.io](https://demo.rerun.io/pr/{{
pr.number }}) (if applicable)

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