Matrix: Strip IRC server from nickname in bridged rooms for avatars
IRC users in bridged rooms usually show up f.e. as @_oftc_devrtz:matrix.org
or similar.
In a conversation with multiple users their avatars will always show "_" as the initial, which can be confusing.
I propose to strip the _SERVER_
part when setting the avatars initials, to make it easier to visually distinguish different users.