allow user to break out of blockquote/etc by hitting enter twice
allow user to break out of blockquote/etc by hitting enter twice

Signed-off-by: Michael Telatynski <94c9867e567d21b48f1c67ccab9a43d4b4ded84f@gmail.com>

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