EmojiPicker: use material icon instead of emoji
EmojiPicker: use material icon instead of emoji

Co-authored-by: Joas Schilling <2bd0f8145e76cd3bbdf3e5ce202d948f0d8b62eb@users.noreply.github.com>
Signed-off-by: Simon Spannagel <385979ae470214a5c3123d1805a076c8e5e65bb4@kth.se>

nextcloud/spreed,nextcloud/spreed,nextcloud/spreed