Reduce width of sharing entry

[JuliaKirschenheuter]

• Part of [BITV] 9.1.4.10/6.2 - At a browser window width of 320 CSS pixels (or at a browser window width of 1280 CSS pixels and 400% zoom magnification), the page contents do not wrap - some information and functions are not available without users having to scroll horizontally. (1) #36965
• Fixes "Files right sidebar"

Summary

Before	After

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[ShGKme]

There is also a second component that has exactly the same styles with the same issue in this place: SharingEntry.vue

Let's fix it as well.

[JuliaKirschenheuter]

failed continuous-integration/drone/pr tests are not related

[JuliaKirschenheuter]

/compile amend /