overlay shared-icon like in app files

[cloud2018]

Is your feature request related to a problem? Please describe.
just increase consistency to app files

Describe the solution you'd like
For shared boards overlay the shared-icon in the bullet just like in the app files for shared folders

Describe alternatives you've considered
Change nothing to keep the UI clear

Additional context
app files:

suggestion for deck:

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[juliusknorr]

Thanks for your suggestiong @cloud2018. While I like the indicator in the right board list, the small icon in the sidebar is definitely to small to be recognized. I think we should instead display it the same way other apps like calendar/contacts are doing it:

For the main list, we probably don't need the sharing indicator at all, since we have a list of user avatars, the board is shared with there.

cc @nextcloud/deck

[juliusknorr]

cc @weeman1337 Something we can probably quickly integrate into the vue branch.

[juliusknorr]

Closing as this was implemented in the vue branch and is now merged to master