Hide social sharing option in private tabs

Background / User story

There is an option in the popup for the user to share their total number of blocked ads on social media.

It would make sense to hide that option in private tabs for multiple reasons:

• the total number of blocked items (which is the number that is shared) is hidden in private tabs, see https://gitlab.com/eyeo/adblockplus/abpui/adblockplusui/-/issues/851
• users are not logged into their accounts on private tabs
• users probably do not want to share any information from the private tabs

For more info, see discussion in https://gitlab.com/eyeo/specs/spec/-/merge_requests/358#note_446735053

What to change

• Design: n/a
• Research: n/a
• Spec: https://gitlab.com/eyeo/specs/spec/-/merge_requests/360
• Legal: https://jira.eyeo.com/browse/ABPUI-48
• Development: n/a

Hints for testers

Test that social sharing section in the popup

• is hidden in private tabs
• is visible and can be interacted with in regular tabs

Hints for translators

n/a

Integration notes

n/a