Fix database selection in admin UI

[phsc84]

RainLoop version, browser, OS:
the-djmaze8, Chrome 85.0.4183.102 (64-bit), Windows 10

Expected behavior and actual behavior:
SnappyMail does not need databases to work properly. And in the admin UI under Contacts you can select between MySQL, SQLite and PostgreSQL. MySQL and SQLite are tagged as unsupported, whereas PostgreSQL is not.
If MySQL and SQLite are really not supported, they should not appear in the dropdown menu. If they are supported, they should be selectable.

Steps to reproduce the problem:
see description above

Logs or screenshots:

[phsc84]

Works perfectly in SnappyMail 2.0.0-rc1.