Remove masquerading logic differences

[maxcbc]

We conditionals based onMASQUERADING in order to do different logic if a user is masquerading.
We need to remove this and if neccesary create a different flag, probably leveraging next-flags for triggering this behaviour.

• ./server/middleware/get-syndication-licence-for-user.js
• ./server/lib/get-contract-by-id.js
• ./server/middleware/get-contract-by-id.js