CADOM_1_19.py: Read correct attribute to verify fabric creation (project-chip#36982)

Wrong attribute was read

Author: Apollon77

src/python_testing/TC_CADMIN_1_19.py

@@ -124,7 +124,7 @@ async def test_TC_CADMIN_1_19(self):
 
         self.step(5)
         # TH reads the CommissionedFabrics attributes from the Node Operational Credentials cluster
-        current_fabrics = await self.read_single_attribute_check_success(dev_ctrl=self.th1, fabric_filtered=False, endpoint=0, cluster=OC_cluster, attribute=OC_cluster.Attributes.SupportedFabrics)
+        current_fabrics = await self.read_single_attribute_check_success(dev_ctrl=self.th1, fabric_filtered=False, endpoint=0, cluster=OC_cluster, attribute=OC_cluster.Attributes.CommissionedFabrics)
         asserts.assert_equal(current_fabrics, max_fabrics, "Expected number of fabrics not correct")
 
         self.step(6)