Correcting import for MessageTypes (#1743)

src/Contracts/ExplorerContracts.ts

@@ -1,6 +1,6 @@
-import { MessageTypes } from "Contracts/MessageTypes";
 import * as ActionContracts from "./ActionContracts";
 import * as Diagnostics from "./Diagnostics";
+import { MessageTypes } from "./MessageTypes";
 import * as Versions from "./Versions";
 
 export { ActionContracts, Diagnostics, MessageTypes, Versions };