rpc: fix getstateheight result compatibility

C#:
   "result" : {
      "localrootindex" : 11623,
      "validatedrootindex" : 11623
   }

Go:
   "result" : {
      "blockHeight" : 11627,
      "stateHeight" : 11627
   }

pkg/rpc/response/result/mpt.go

@@ -10,8 +10,8 @@ import (
 
 // StateHeight is a result of getstateheight RPC.
 type StateHeight struct {
-	BlockHeight uint32 `json:"blockHeight"`
-	StateHeight uint32 `json:"stateHeight"`
+	Local     uint32 `json:"localrootindex"`
+	Validated uint32 `json:"validatedrootindex"`
 }
 
 // ProofWithKey represens key-proof pair.

pkg/rpc/server/server.go

@@ -969,8 +969,8 @@ func (s *Server) getStateHeight(_ request.Params) (interface{}, *response.Error)
 		stateHeight = height - 1
 	}
 	return &result.StateHeight{
-		BlockHeight: height,
-		StateHeight: stateHeight,
+		Local:     height,
+		Validated: stateHeight,
 	}, nil
 }
 

pkg/rpc/server/server_test.go

@@ -324,8 +324,8 @@ var rpcTestCases = map[string][]rpcTestCase{
 				sh, ok := res.(*result.StateHeight)
 				require.True(t, ok)
 
-				require.Equal(t, e.chain.BlockHeight(), sh.BlockHeight)
-				require.Equal(t, uint32(0), sh.StateHeight)
+				require.Equal(t, e.chain.BlockHeight(), sh.Local)
+				require.Equal(t, uint32(0), sh.Validated)
 			},
 		},
 	},