[FIX] project: operator should use in or not

Before this commit, the domain term was using = or != as an operator
with an array as a right expression. This creates a warning in the log
when normalizing the leaf of the domain.

Now, the operations = or != are replaced by in or not in.

closes odoo/odoo#139032

Related: odoo/enterprise#49115
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>
Signed-off-by: Jorge Pinna Puissant (jpp) <jpp@odoo.com>

addons/project/models/project_task.py

@@ -1138,6 +1138,10 @@ class Task(models.Model):
                     if isinstance(value, str) or (isinstance(value, list) and not all(isinstance(val, str) for val in value)):
                         new_domain.append(("name", op, value))
                     if isinstance(value, int):
+                        if op == "=":
+                            op = "in"
+                        if op == "!=":
+                            op = "not in"
                         new_domain.append(("id", op, [value]))
                 else:
                     new_domain.append(dom)