[FIX] project_timesheet: timesheets order in task form

This revision is related to 432f199f.

Since the above revision make sure to change the
editable list to `bottom`,
the order of the list should be done on the `date` (asc),
on this view, as this is more likely that, when adding a new line,
that the date set on this new line is
more recent than the dates on the other lines.

The new added line should therefore appear directly at the bottom
of the list, to avoid consufing the user.

Besides, the default order of the model `account.analytic.line`
is set to `date desc, id desc`

opw-659892

addons/project_timesheet/project_timesheet_view.xml

@@ -66,7 +66,7 @@
                 <xpath expr="//notebook/page[@name='description_page']" position="after">
                     <page string="Timesheets" groups="project.group_tasks_work_on_tasks,project.group_time_work_estimation_tasks">
                     <field name="timesheet_ids" groups="project.group_tasks_work_on_tasks" context="{'default_account_id' : analytic_account_id, 'default_is_timesheet' : 1}">
-                        <tree editable="bottom" string="Timesheet Activities">
+                        <tree editable="bottom" string="Timesheet Activities" default_order="date">
                             <field name="date"/>
                             <field name="user_id" required="1"/>
                             <field name="name"/>