Fix bug in identity key conflict edge case

When resolving conflicts, we should not only discard the old key, but
set the new trusted key to the one the user has verified. Previously, we
would end up trusting the first-seen new key, which may not be the one
the user verified.

 // FREEBIE

js/models/conversations.js

@@ -258,7 +258,9 @@
         }
     },
 
-    resolveConflicts: function(number) {
+    resolveConflicts: function(conflict) {
+        var number = conflict.number;
+        var identityKey = conflict.identityKey;
         if (this.isPrivate()) {
             number = this.id;
         } else if (!_.include(this.get('members'), number)) {
@@ -270,12 +272,14 @@
         }
 
         return textsecure.storage.axolotl.removeIdentityKey(number).then(function() {
+            return textsecure.storage.axolotl.putIdentityKey(number, identityKey).then(function() {
                 this.messageCollection.each(function(message) {
                     if (message.hasKeyConflict(number)) {
                         message.resolveConflict(number);
                     }
                 });
             }.bind(this));
+        }.bind(this));
     },
     hashCode: function() {
         if (this.hash === undefined) {

js/views/key_conflict_dialogue_view.js

@@ -41,7 +41,7 @@
         },
         resolve: function() {
             new Promise(function(resolve) {
-                this.conversation.resolveConflicts(this.model.number).then(resolve);
+                this.conversation.resolveConflicts(this.model).then(resolve);
             }.bind(this));
             this.trigger('resolve');
             this.remove();