Fix message detail contacts for incoming group message

Previously the From-field displayed all the group contacts.

js/views/message_detail_view.js

@@ -99,12 +99,20 @@
             }));
             this.view.render().$el.prependTo(this.$el.find('.message-container'));
 
+            if (this.model.isOutgoing()) {
                 this.conversation.contactCollection.each(function(contact) {
                     var v = new ContactView({
                         model: contact,
                         conflict: this.model.getKeyConflict(contact.id)
                     }).render().$el.appendTo(this.$el.find('.contacts'));
                 }.bind(this));
+            } else {
+                var contact = this.conversation.contactCollection.get(this.model.get('source'));
+                var v = new ContactView({
+                    model: contact,
+                    conflict: this.model.getKeyConflict(contact.id)
+                }).render().$el.appendTo(this.$el.find('.contacts'));
+            }
         }
     });