use server name as source for chanserv mode changes, for consistency

irc/chanserv.go

 				if member.Account() == change.Arg {
 					applied, change := channel.applyModeToMember(client, change, rb)
 					if applied {
-						announceCmodeChanges(channel, modes.ModeChanges{change}, chanservMask, "*", "", rb)
+						announceCmodeChanges(channel, modes.ModeChanges{change}, server.name, "*", "", rb)
 					}
 				}
 			}
 		},
 		rb)
 	if applied {
-		announceCmodeChanges(channelInfo, modes.ModeChanges{change}, chanservMask, "*", "", rb)
+		announceCmodeChanges(channelInfo, modes.ModeChanges{change}, server.name, "*", "", rb)
 	}
 
 	csNotice(rb, client.t("Successfully granted operator privileges"))