Change the background of the user profile picture to transparent.

### Is your feature request related to a problem?
If the user profile picture is partially transparent, it always have a white background.

### Describe the solution you'd like
Remove the white background and make it also transparent.

### Describe alternatives you've considered
Instead of making it transparent, change the background to the app / search bar background color (white in light mode, gray in dark mode)

### Additional context
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