[Bug] Inactive checkbox shown on registration page

Reported by @klausenbusk

• I have described the bug in complete detail in the Description section.
• I have specified steps in the Reproduction section.
• I have included the versions which are affected in the Version(s) section.

Description

The Inactive checkbox is used to set an account to Suspended = 1 state in the database. This should not be controllable by users of account type User.

Reproduction

Browse to /register while not logged in.

Version(s)

This can be seen underneath the e4a5b7fa commit.