Bugfix. Show custom status, not chat status.

src/converse-controlbox.js

@@ -512,7 +512,7 @@
 
                 renderStatusChangeForm: function (ev) {
                     ev.preventDefault();
-                    var status_message = this.model.get('status') || 'offline';
+                    var status_message = converse.xmppstatus.get('status_message') || '';
                     var input = converse.templates.change_status_message({
                         'status_message': status_message,
                         'label_custom_status': __('Custom status'),

src/templates/change_status_message.html

 <form id="set-custom-xmpp-status" class="pure-form">
 <fieldset>
     <span class="input-button-group">
-        <input type="text" class="custom-xmpp-status" {{status_message}} placeholder="{{label_custom_status}}"/>
+        <input type="text" class="custom-xmpp-status" value="{{status_message}}" placeholder="{{label_custom_status}}"/>
         <input type="submit" class="pure-button button-primary" value="{{label_save}}"/>
     </span>
 </fieldset>