Fix bad mac on repeated deliveries

`MessageCounterError` is the expected result of repeated deliveries.
Error handling in decryptWithSessionList should immediately return such
an error if it occurs. Previous to this change, a Bad MAC error to be
returned instead of a MessageCounterError, if the message in question
was encrypted for a closed session.

dist/libsignal-protocol.js

@@ -36176,6 +36176,10 @@ SessionCipher.prototype = {
     return this.doDecryptWhisperMessage(buffer, session).then(function(plaintext) {
         return { plaintext: plaintext, session: session };
     }).catch(function(e) {
+        if (e.name === 'MessageCounterError') {
+            return Promise.reject(e);
+        }
+
         errors.push(e);
         return this.decryptWithSessionList(buffer, sessionList, errors);
     }.bind(this));

src/SessionCipher.js

@@ -124,6 +124,10 @@ SessionCipher.prototype = {
     return this.doDecryptWhisperMessage(buffer, session).then(function(plaintext) {
         return { plaintext: plaintext, session: session };
     }).catch(function(e) {
+        if (e.name === 'MessageCounterError') {
+            return Promise.reject(e);
+        }
+
         errors.push(e);
         return this.decryptWithSessionList(buffer, sessionList, errors);
     }.bind(this));