Enable privacy app, to conform w/ the new default

[7heo]

The following changes are implemented

Add the privacy app to the default enabled apps. See https://forum.cortezaproject.org/t/privacy-namespace-issue/1911/6.

Changes in the user interface:

Does not redirect to the front page by default when clicking on the "privacy" app.

Checklist when submitting a final (!draft) PR

• Commits are tidied up, squashed if needed and follow guidelines in CONTRIBUTING.md
• Code builds
• All existing tests pass
• All new critical code is covered by tests
• PR is linked to the relevant issue(s)
• Rebased with the target branch

[7heo]

Given the triviality of changes, I did not bother adding tests or testing the build. I hope this is alright.

Edit: also, I did not find tests for non-API routes for the various webapps, so in case any of the webapps get disabled by mistake, the regression will likely go undetected.

[Fajfa]

Thanks for this, will merge!