Remove cookie-parser middleware

[jhsware]

https://www.npmjs.com/package/express-session
From express-session
Note Since version 1.5.0, the cookie-parser middleware no longer needs to be used for this module to work. This module now directly reads and writes cookies on req/res. Using cookie-parser may result in issues if the secret is not the same between this module and cookie-parser.

• kth-session uses "express-session": "^1.13.0"