gpui: Fix img element to render correct SVG color (#15488)

Release Notes:

- N/A


It should convert RGBA to BGRA.

> I added an example color svg, that was I make based on [Lucide grip
icon](https://lucide.dev/icons/grip).

## Before

<img width="692" alt="image"
src="https://github.com/user-attachments/assets/5eb03606-76ce-4049-b3ad-8d1084a4fa55">


## After

<img width="695" alt="image"
src="https://github.com/user-attachments/assets/650dd411-2095-4e92-b3fd-8e91c6954aa3">

Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>