Fix Trix to use paragraphs and break on return

[mikiher]

Brief summary

This fixes a couple of issues with the Trix text editor

In-depth Description

• Trix translates p tags to div by default, and inserts redundant br tags on paragraph breaks. This fixes this.
• Trix by default always puts a br tag on Enter, and never breaks a paragraph (there's literally no way to start a new paragraph). This changes the behavior to break paragraphs on Enter (you can still use Shfit+Enter for line breaks, like in other normal editors)

How have you tested this?

This was tested on various podcast episode descriptions in the Episode Details tab.

[advplyr]

Working great, thanks!