fixed first name display in userDetails

src/header.pug

@@ -17,8 +17,7 @@ include templates/hd-user-avatar.pug
 details#user-controls
   summary(tabindex='0' role='button')
     sib-display#user-controls__profile(
-      fields='firstName, account.picture'
-      extra-context='{firstName:"first_name"}'
+      fields='first_name, account.picture'
       widget-account.picture='hd-user-avatar'
       bind-user
     )

src/styles/base/header.scss

@@ -157,7 +157,7 @@
           width: 45%;
         }
   
-        sib-display-value[name='firstName'] {
+        sib-display-value[name='first_name'] {
           @include icon('arrow-down');
           align-items: center;
           display: flex;