Adjust emoji sorting such that exact matches/prefixes appear first
Adjust emoji sorting such that exact matches/prefixes appear first

fixes https://github.com/vector-im/riot-web/issues/4704

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