[FIX] stock: traceability downstream order and date

The traceability report in downstream was looking for newer move lines
instead of older ones, which leads to not showing all related traceable
moves.

We also changed the sort order of the move_lines in downstream

addons/stock/models/stock_traceability.py

@@ -57,7 +57,7 @@ class MrpStockReport(models.TransientModel):
                         ('lot_id', '=', move_line.lot_id.id),
                         ('location_id', '=', move_line.location_dest_id.id),
                         ('id', '!=', move_line.id),
-                        ('date', '<', move_line.date),
+                        ('date', '>', move_line.date),
                     ])
         if res:
             res |= self.get_move_lines_downstream(res)
@@ -278,7 +278,10 @@ class MrpStockReport(models.TransientModel):
         else:
             for move_line in obj_ids:
                 final_vals += self.make_dict_head(level, stream=stream, parent_id=line_id, model=model or 'stock.pack.operation', move_line=move_line)
-        final_vals = sorted(final_vals, key=lambda v: v['date'], reverse=True)
+        reverse_sort = True
+        if stream == "downstream":
+            reverse_sort = False
+        final_vals = sorted(final_vals, key=lambda v: v['date'], reverse=reverse_sort)
         lines = self.final_vals_to_lines(final_vals, level)
         return lines