Revert "rpc: marshal fees and GAS as Fixed8 decimal"

This reverts commit a79b12b4d4.

pkg/core/state/notification_event_test.go

@@ -132,21 +132,7 @@ func TestMarshalUnmarshalJSONAppExecResult(t *testing.T) {
 				Events:      []NotificationEvent{},
 			},
 		}
-
-		data, err := json.Marshal(appExecResult)
-		require.NoError(t, err)
-		expected := `{
-			"container":"0x` + appExecResult.Container.StringLE() + `",
-			"trigger":"Application",
-			"vmstate":"HALT",
-			"gasconsumed":"0.0000001",
-			"stack":[],
-			"notifications":[]
-}`
-		require.JSONEq(t, expected, string(data))
-		actual := new(AppExecResult)
-		require.NoError(t, json.Unmarshal(data, actual))
-		require.Equal(t, appExecResult, actual)
+		testserdes.MarshalUnmarshalJSON(t, appExecResult, new(AppExecResult))
 	})
 
 	t.Run("positive, fault state", func(t *testing.T) {