correct bus parameter after rebase

Author: lukelowry

tests/UnitTests/PhasorDynamics/ConverterRegcaTests.hpp

@@ -600,7 +600,7 @@ namespace GridKit
       "class": "bus",
       "name": "Bus 1",
       "init": { "Vr": 1.0, "Vi": 0.0 },
-      "v_base": 1.0
+      "params": { "kv": 1.0 }
     }
   ],
   "devices": [