Restore correct default AS number

This was accidentally changed from 64514 to 12345, while this test was
disabled, by commit 03fec6d.

calico_node/tests/st/bgp/test_single_route_reflector.py

@@ -43,7 +43,7 @@ def _test_single_route_reflector(self, backend='bird'):
 
             # Set the default AS number - as this is used by the RR mesh, and
             # turn off the node-to-node mesh (do this from any host).
-            update_bgp_config(host1, asNum=12345, nodeMesh=False)
+            update_bgp_config(host1, asNum=64514, nodeMesh=False)
 
             # Create a workload on each host in the same network.
             network1 = host1.create_network("subnet1")