Include remote registrationId in encryption result

The signal service requires this field to accompany outgoing ciphertexts.
With this change we can likely remove the correspinding getter from
SessionCipher.

Author: liliakai

dist/libsignal-protocol.js

@@ -36124,9 +36124,18 @@ SessionCipher.prototype = {
 
               preKeyMsg.message = message;
               var result = String.fromCharCode((3 << 4) | 3) + util.toString(preKeyMsg.encode());
-              return {type: 3, body: result};
+              return {
+                  type           : 3,
+                  body           : result,
+                  registrationId : record.registrationId
+              };
+
           } else {
-              return {type: 1, body: util.toString(message)};
+              return {
+                  type           : 1,
+                  body           : util.toString(message),
+                  registrationId : record.registrationId
+              };
           }
       });
     }.bind(this));

src/SessionCipher.js

@@ -94,9 +94,18 @@ SessionCipher.prototype = {
 
               preKeyMsg.message = message;
               var result = String.fromCharCode((3 << 4) | 3) + util.toString(preKeyMsg.encode());
-              return {type: 3, body: result};
+              return {
+                  type           : 3,
+                  body           : result,
+                  registrationId : record.registrationId
+              };
+
           } else {
-              return {type: 1, body: util.toString(message)};
+              return {
+                  type           : 1,
+                  body           : util.toString(message),
+                  registrationId : record.registrationId
+              };
           }
       });
     }.bind(this));