Remove duplicate user_header elements

[cconard96]

Checklist before requesting a review

• I have read the CONTRIBUTING document.
• I have performed a self-review of my code.

Description

In both horizontal and vertical menu modes, the user_header.html.twig template is always included twice and set so that when the lg breakpoint is reached, one is hidden while the other appears. I am not able to see any difference in behavior between that and having a single inclusion.

[AdrienClairembault]

Isn't it just meant to be displayed at different breakpoints?

Before:

After:

nok on some views

[orthagh]

Yes, it's exactly for this purpose.
Note, I'm not displeased by the second screenshot, and if everyone agrees, we could move to a single occurrence in the code.

[cedric-anne]

Yes, it's exactly for this purpose. Note, I'm not displeased by the second screenshot, and if everyone agrees, we could move to a single occurrence in the code.

If the menu still works at this new location on mobile devices, then I am OK with it. Having only one occurence of the menu is preferable.

[cconard96]

I don't see the same thing in the After screenshot.

[AdrienClairembault]

If the menu still works at this new location on mobile devices, then I am OK with it. Having only one occurence of the menu is preferable.

I disagree, having a logo alone on the right side feels very disturbing IMO.
While it reduce the code, it is also inconsistent with the desktop UI where the user menu dropdown is on the first line.