Fix rendering text replies

[tulir]

Reply fallbacks are about to go away completely (matrix-org/matrix-spec-proposals#2781, element-hq/element-web#28406) and Element will probably get a lot of complaints if rendering replies doesn't work correctly. According to @AmineI (in #8162 (comment)) just switching formattedText to takeFormatted() may resolve the issue for text replies.

I haven't tested this myself. If the fix works, I assume the problem is that element was assuming formatted_body is always present, even though it's not required. To test: send /plain text as a reply using develop.element.io and ensure both the quote and reply text are visible in element android (the /plain should prevent formatted_body being added to the message).

Fixes #7445
Fixes #8162
Fixes #8460
Fixes #8866

Image replies will remain broken (#8432, #6570)

[CLAassistant]

All committers have signed the CLA.

[bmarty]

Thanks!