[FIX] project_timesheet: timesheets on tasks editable bottom.

The policy regarding the editable lists is:
 - In a one2many list, editable bottom
 - In a list, editable top.

So, when you hit the add an item (one2many list) / create (list),
you do not have to scroll a lot if there are a lot of lines.

opw-656363

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="top" string="Timesheet Activities">
+                        <tree editable="bottom" string="Timesheet Activities">
                             <field name="date"/>
                             <field name="user_id" required="1"/>
                             <field name="name"/>