Fix TypeError

due to `storage.Direction` not being defined in libsignal.

dev.html

@@ -12,7 +12,7 @@
     <link rel="shortcut icon" type="image/ico" href="images/favicon.ico"/>
     <link type="text/css" rel="stylesheet" media="screen" href="dist/website.css" />
     <link type="text/css" rel="stylesheet" media="screen" href="dist/converse.css" />
-    <script src="https://cdn.conversejs.org/3rdparty/libsignal-protocol.min.js"></script>
+    <script src="3rdparty/libsignal-protocol.js"></script>
     <script src="dist/converse.js"></script>
 </head>
 

src/plugins/omemo/store.js

@@ -12,6 +12,13 @@ const { Strophe, $build, u } = converse.env;
 
 class OMEMOStore extends Model {
 
+    get Direction () {
+        return {
+            SENDING: 1,
+            RECEIVING: 2
+        }
+    }
+
     getIdentityKeyPair () {
         const keypair = this.get('identity_keypair');
         return Promise.resolve({