fix: remove username input

src/views/admin/page-admin-users-edit.pug

@@ -11,16 +11,14 @@ div.content-box__info.flex
   solid-form.form.button-register(
     bind-resources=''
 
-    fields='line-1(first_name, last_name), line-2(username, email)'
+    fields='line-1(first_name, last_name), line-2(email)'
 
     class-first_name='form-label is-light is-half-width input-text-like'
     class-last_name='form-label is-light is-half-width input-text-like'
-    class-username='form-label is-light is-half-width input-text-like'
-    class-email='form-label is-light is-half-width input-text-like'
+    class-email='form-label is-light is-full-width input-text-like'
 
     label-first_name='Prénom *'
     label-last_name='Nom *'
-    label-username='Nom d\'utilisateur *'
     label-email='E-mail *'
 
     next='admin-user-list'