irc_versions.yml: Remove hide-on-servers from UTF8ONLY configuration

Remove 'hide-on-servers' property from UTF8ONLY.

Author: ValwareIRC

_data/irc_versions.yml

@@ -183,7 +183,6 @@ stable:
       description: UTF8ONLY ISUPPORT token
       link: /specs/extensions/utf8-only.html
       hide-if-no-support: true
-      hide-on-servers: true
       isupport:
         - UTF8ONLY
     webirc: