[FIX] b_shift: PR #62 and #63

This fixes PR #62 and #63. It uses the `no_create` and `no_open` options
for `many2many` widget.

beesdoo_shift/views/task.xml

@@ -98,8 +98,11 @@
                             <field name="task_template_id" />
                             <field name="task_type_id" />
                             <field name="super_coop_id" />
-                            <field name="worker_id" options="{'create': false, 'create_edit': false}"/>
-                            <field name="replaced_id" attrs="{'invisible': [('is_regular', '!=', True)]}"/>
+                            <field name="worker_id" options="{'no_create': True, 'no_open': True}"/>
+                            <field name="replaced_id"
+                                   options="{'no_create': True, 'no_open': True}"
+                                   domain="[('working_mode', '=', 'regular')]"
+                                   attrs="{'invisible': [('is_regular', '!=', True)]}"/>
                             <field name="is_regular" attrs="{'invisible': [('working_mode', '=', 'irregular')]}"/>
                             <field name="working_mode" invisible="1" />
                         </group>