chore: 🤖 update user profile icon to flight

ui/admin/app/templates/application.hbs

@@ -16,7 +16,7 @@
         <header.utilities as |utilities|>
           <utilities.dropdown
             @text={{this.session.data.authenticated.username}}
-            @icon='app-icons/user-profile'
+            @icon='flight/user-circle-16'
             as |dropdown|
           >
             <dropdown.link @route='account.change-password'>