Adjusts the files multi select header width

[weeman1337]

Just a tiny style adjustment to align the files multi select header.

closes #10330

[skjnldsv]

Please use the proper variable :)
$navigation-width

[weeman1337]

@skjnldsv done. I wasn't sure if I can use it, because it's located under core and the other style file is under app/files. So the core variables can be used from any app shipped by default?

[skjnldsv]

You rocks! :)
Also, now that you're a contributor, you should be able to directly create branches from the nextcloud/server repo ;)

[skjnldsv]

So the core variables can be used from any app shipped by default?

Any variable used in variables.scss is appended to the compilation of the file, so you're free to use the variables directly yes :)
Note though that we deprecated the use of the scss variables for 15 in favor of css4 variables. So the variables.scss file won't be appended to the scss files anymore in the next version (15)

[MorrisJobke]

Tested and works 👍