Fix contactsmenu for mentioned users in comments

[juliusknorr]

Before:

After:

[skjnldsv]

@juliushaertl how do we access the ui regression tests? :)

It is still saying

+ echo "The result can be found at https://s3.bitgrid.net/nextcloud-ui-regression/nextcloud/server/10856/index.html"
The result can be found at https://s3.bitgrid.net/nextcloud-ui-regression/nextcloud/server/10856/index.html

[juliusknorr]

@skjnldsv https://ci-assets.nextcloud.com/nextcloud-ui-regression/nextcloud/server/10856/index.html