[FIX] mail: send the correct args to the message_unsubscribe method

Before this commit it was not possible to remove a channel from the followers.

task-2324263

closes odoo/odoo#57817

X-original-commit: 9a065048bbdd09072084d03e67fd012766ddbe23
Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

addons/mail/static/src/components/follower_list_menu/follower_list_menu_tests.js

@@ -365,7 +365,7 @@ QUnit.test('click on remove follower', async function (assert) {
                 assert.step('message_unsubscribe');
                 assert.deepEqual(
                     args.args,
-                    [[100], [self.env.messaging.currentPartner.id]],
+                    [[100], [self.env.messaging.currentPartner.id], []],
                     "message_unsubscribe should be called with right argument"
                 );
             }

addons/mail/static/src/models/follower/follower.js

@@ -77,16 +77,17 @@ function factory(dependencies) {
          * Remove this follower from its related thread.
          */
         async remove() {
-            const args = [[this.followedThread.id]];
+            const partner_ids = [];
+            const channel_ids = [];
             if (this.partner) {
-                args.push([this.partner.id]);
+                partner_ids.push(this.partner.id);
             } else {
-                args.push([this.channel.id]);
+                channel_ids.push(this.channel.id);
             }
             await this.async(() => this.env.services.rpc({
                 model: this.followedThread.model,
                 method: 'message_unsubscribe',
-                args
+                args: [[this.followedThread.id], partner_ids, channel_ids]
             }));
             this.delete();
         }