HTML composer is missing.

[PaulTGG]

🐛 Bugreport

The compose page is defaulting to plain text emails, with no way to write a HTML message. This is causing an issue where replying to rich text/HTML emails adds all the email markup to the reply. The screenshot is showing my compose page, with HTML selected as the outbound mail format.

Version & Environment

Rev: 02182bb

OS: []

Steps to reproduce

1. Install latest Cypht.
2. Change outbound mail format setting to "HTML"
3. Compose an email.

[marclaporte]

Related: #1136