[native][web] Stop limiting media encryption to staff community

Summary:
We had a check that enabled encrypted media only for staff community. Hardcoded it to enable encryption for all communities.

Depends on D13889

Test Plan: Used my local community for testing. Verified that after this change, multimedia messages are now of type encrypted-{photo,video}.

Reviewers: ashoat

Reviewed By: ashoat

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D13890