Fix check for session equivalence

This check didn't work, which resulted in closing and then immediately
reopening the current session. Not that big a deal, since it merely
flips a flag off and back on again just before saving the session
record, but does result in spurious log statements.

Author: liliakai

dist/libsignal-protocol.js

@@ -36177,7 +36177,7 @@ SessionCipher.prototype = {
             var errors = [];
             return this.decryptWithSessionList(buffer, record.getSessions(), errors).then(function(result) {
                 return this.getRecord(address).then(function(record) {
-                    if (result.session !== record.getOpenSession()) {
+                    if (result.session.indexInfo.baseKey !== record.getOpenSession().indexInfo.baseKey) {
                       record.archiveCurrentState();
                       record.promoteState(result.session);
                     }

src/SessionCipher.js

@@ -143,7 +143,7 @@ SessionCipher.prototype = {
             var errors = [];
             return this.decryptWithSessionList(buffer, record.getSessions(), errors).then(function(result) {
                 return this.getRecord(address).then(function(record) {
-                    if (result.session !== record.getOpenSession()) {
+                    if (result.session.indexInfo.baseKey !== record.getOpenSession().indexInfo.baseKey) {
                       record.archiveCurrentState();
                       record.promoteState(result.session);
                     }