Bugfix. Nickname wasn't being set correctly in vcard

src/converse-profile.js

@@ -112,6 +112,7 @@
 
                     const data = {
                         'fn': form_data.get('fn'),
+                        'nickname': form_data.get('nickname'),
                         'role': form_data.get('role'),
                         'email': form_data.get('email'),
                         'url': form_data.get('url'),

src/templates/vcard.html

 <vCard xmlns="vcard-temp">
     <FN>{{{o.fn}}}</FN>
-    <NICKNAME>{{{o.fn}}}</NICKNAME>
+    <NICKNAME>{{{o.nickname}}}</NICKNAME>
     <URL>{{{o.url}}}</URL>
     <ROLE>{{{o.role}}}</ROLE>
     <EMAIL><INTERNET/><PREF/><USERID>{{{o.email}}}</USERID></EMAIL>