Theme selection UI fix

[tanmoyAtb]

closes #1019

[render]

Your Render PR Server URL is https://files-ui-stage-pr-1033.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-c2hselr2v8p851phesv0.

[Tbaut]

Looks good :)

[FSM1]

looking good :)

[Tbaut]

Tests are flaky with a 60s load event on the main page. This is weird, I'll look into this:

 |   Settings
 |     ✓ can navigate to the settings profile page (10068ms)
 |     1) can navigate to the settings security page on a phone
 | 
 | 
 |   1 passing (1m)
 |   1 failing
 | 
 |   1) Settings
 |        can navigate to the settings security page on a phone:
 |      CypressError: Timed out after waiting `60000ms` for your remote page to load.
 | 
 | Your page did not fire its `load` event within `60000ms`.

[tanmoyAtb]

Tests are flaky with a 60s load event on the main page. This is weird, I'll look into this:

 |   Settings
 |     ✓ can navigate to the settings profile page (10068ms)
 |     1) can navigate to the settings security page on a phone
 | 
 | 
 |   1 passing (1m)
 |   1 failing
 | 
 |   1) Settings
 |        can navigate to the settings security page on a phone:
 |      CypressError: Timed out after waiting `60000ms` for your remote page to load.
 | 
 | Your page did not fire its `load` event within `60000ms`.

Thanks, @Tbaut I was getting confused with this,
The tests have passed after a new merge with dev,
I am merging this PR for now.

[Tbaut]

yeah I just relaunched it and it passed, that's def not normal. I'll see if it happens again.