[MM-62711] Don't count non-members in the provided list (#30349)

Co-authored-by: Mattermost Build <build@mattermost.com>

webapp/channels/src/components/channel_members_rhs/member_list.tsx

@@ -103,7 +103,7 @@ const MemberList = ({
                         <Member
                             channel={channel}
                             index={index}
-                            totalUsers={members.length}
+                            totalUsers={members.filter((l) => l.type === ListItemType.Member).length}
                             member={member}
                             editing={editing}
                             actions={{openDirectMessage}}