Remove unneeded styles: everything is handled by NcVue

[JuliaKirschenheuter]

• For [BITV]: change styles for focused items in sidebar #41699
• Blocked by Harmonize focus-visible styles for vue-navigation item with none-vue navigation item nextcloud-libraries/nextcloud-vue#5022

Summary

Vue-navigation	Unchanged non-vue navigation

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]

This PR changes styles for non-@nextcloud-vue navigation while linked PR in nextcloud-vue changes @nextcloud/vue navigation. Are they related?

yes ;(

[emoral435]

I checked this on my dev env and saw that removing this did not cause anything big to stylistically change - it looks good to me.

I do not know if there are any other apps that somehow depend on this, but to my understanding this only lets the elements that are for app navigation within a page have their border color be the primary color. When the changes to the NcAppNavigationItem.scss gets merged, this will be all good 👍

[ShGKme]

This PR changes styles for non-@nextcloud-vue navigation while linked PR in nextcloud-vue changes @nextcloud/vue navigation. Are they related?

So, these styles are not supposed to affect @nextcloud/vue/NcAppNavigation. But it does, because the layout of the NcAppNavigation was changed and the selector here is not actual anymore.

So the best could be to fix the selector.

but probably these styles are not actual anymore. Need to check if we still have any non-NcAppNavigation navigation.

[ShGKme]

I haven't found non-vue navigation anywhere. Should be safe to remove.

[JuliaKirschenheuter]

/backport to stable28