hr_timesheet_sheet* fixes: back to list after remove a timesheet. bulk unfreeze confirmed and pending sheets

hr_timesheet_sheet_delete_cascade/models/hr_timesheet_sheet.py

@@ -304,5 +304,9 @@ class Sheet(models.Model):
                 active_model="hr_timesheet.sheet",
                 active_ids=self.ids,
                 active_id=self.ids[0] if self.ids else False,
+                # The button lives in the header of the sheet form: once the
+                # sheet is gone that form cannot be restored, and the wizard
+                # has to send the user somewhere else.
+                sheet_delete_cascade_from_form=True,
             ),
         }