Revert "send fallback in pre tags, not code" (code looks better)
Revert "send fallback in pre tags, not code" (code looks better)

This reverts commit e4448ae1ad87cbd3e47c73a589012494ec7d4189.

matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk