Remove error from logs when user closes the withdrawal modal during transaction assembly

[michalinacienciala]

We are throwing an error in the logs when user closes the withdrawal modal during transaction assembly.

Pre-requisite: an account with withdrawable funds
Steps:

1. Open the withdrawal form
2. Provide amount
3. Press Withdraw
4. Click X on the Building transaction data modal

Result:
Window closed, but error thrown in the logs (and visible in Sentry):

Uncaught (n promise) Error: Withdrawal cancelled`

As discussed on Discord, we should check if we can safely suppress the error

[linear]

AENG-29 Remove error from logs when user closes the withdrawal modal during transaction assembly