Fixed user authentication details in mobile navbar

[sachintom999]

Whether the user has logged in or not, the mobile navbar always shows the "Sign In" and "Sign Up" .

The commit fixes this.

It shows the details correctly if the user has logged in or not.

Attaching the "before" and "after" screenshots

Before Fix

After Fix

[dogukanteber]

Hi, @sachintom999. Thank you for your contribution. It is a crucial and important fix. Also, thank you for the illustration 🎸

[adrianmcphee]

Super work @sachintom999