Changed variable renderOnlineUsers to renderOnline in soluion seed. (#39229)

In the challenge seed renderOnline variable has been used and referenced but in the solution seed the variable has been changed to renderOnlineUser so, changed renderOnlineUsers back to renderOnline variable.

curriculum/challenges/english/03-front-end-libraries/react/use-array.filter-to-dynamically-filter-an-array.english.md

@@ -146,7 +146,7 @@ class MyComponent extends React.Component {
     const usersOnline = this.state.users.filter(user => {
       return user.online;
     });
-    const renderOnlineUsers = usersOnline.map(user => {
+    const renderOnline = usersOnline.map(user => {
       return (
         <li key={user.username}>{user.username}</li>
       );
@@ -155,7 +155,7 @@ class MyComponent extends React.Component {
        <div>
          <h1>Current Online Users:</h1>
          <ul>
-          {renderOnlineUsers}
+          {renderOnline}
         </ul>
        </div>
     );