* Removed redundant code

[kesrishubham2510]

• Replaced jwtService.validateToken(token, userDetails) call with jwtService.isTokenExpired(token)

Description

This `userName.equals(userDetails.getUsername()` is redundant because,

* Will always result in true
* The username is retrieved from the token in the JwtFilter
* The UserDetails argument is initialised in the JwtFilter by passing the same username retrieved from the received bearer token