fix(CWUser): add missing `key` prop to list elements

{{ cookiecutter.project_slug }}/src/components/cwusers/CWUsers.tsx

@@ -18,7 +18,7 @@
       <h1>CWUsers from {cwserver}</h1>
       <ul>
         {cwusers.map((cwuser) => (
-          <li>
+          <li key={cwuser.login}>
             <BsPersonCircle /> - {cwuser.firstname} {cwuser.surname} (
             {cwuser.login})
           </li>