[FIX] im_livechat: fix channel member service patch

This commit fixes several issues with the channel member
service patch:
- patch should be applied to prototype
- super should be provided the params given to the patch

closes odoo/odoo#127349

Signed-off-by: Didier Debondt (did) <did@odoo.com>

addons/im_livechat/static/src/core/channel_member_service_patch.js

@@ -3,10 +3,10 @@
 import { ChannelMemberService } from "@mail/core/common/channel_member_service";
 import { patch } from "@web/core/utils/patch";
 
-patch(ChannelMemberService, "im_livechat", {
+patch(ChannelMemberService.prototype, "im_livechat", {
     getName(member) {
         if (member.thread.type !== "livechat") {
-            return this._super();
+            return this._super(member);
         }
         if (member.persona.user_livechat_username) {
             return member.persona.user_livechat_username;
@@ -14,6 +14,6 @@ patch(ChannelMemberService, "im_livechat", {
         if (member.persona.is_public) {
             return member.thread.anonymous_name;
         }
-        return this._super();
+        return this._super(member);
     },
 });