[FIX] im_livechat : fix random operator and channel name mismatch
[FIX] im_livechat : fix random operator and channel name mismatch

Before, the name of the channel was not always matching the real channel operator,
as a second random was made on operators.

This commit fix this.

Task ID : 1918350
Closes PR #29570
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo