Fix compilation

[nickvergessen]

• Use the correct app name for sharing events (required for Limit file activities to favorites #271 + Correct the app name for sharing events core#15312 )
• Do not wrap the activity with a link, when the activity contains one
• Allow extensions to filter the 'all' filter (required for Limit file activities to favorites #271)
• Hide the navigation entries when they are just duplicates or empty

@LukasReschke

[karlitschek]

makes sense 👍

[LukasReschke]

👍