[FIX] stock_dropshipping: fix test classes

Commit 52c89ade added a test in v11.
Commit 1e0a92c9 forward-ported that commit to v12, that already had a test.
As a result, the class TestDropship was defined twice.
It follows that the first test was not executed.

opw 1957701

closes odoo/odoo#32792

Signed-off-by: Nans Lefebvre (len) <len@odoo.com>

addons/stock_dropshipping/tests/test_dropship.py

@@ -48,9 +48,6 @@ class TestDropship(common.TransactionCase):
         so.order_line.product_uom_qty = 2.00
         self.assertAlmostEqual(po_line.product_qty, 2.00)
 
-
-class TestDropship(common.TransactionCase):
-
     def test_00_dropship(self):
 
         # Create a vendor