[Cashtab] Comments in loadContactList should refer to contactList, not settings

Summary: Related to T2661. Comments in the loadContactList function in useWallet.js should refer to 'contactList' obj in local storage, not 'settings' obj.

Test Plan:
navigate to web/cashtab/hooks/useWallet.js
find the loadContactList function
at lines 1089 & 1101, observe that the comments refer to the contactList obj in local storage

Reviewers: bytesofman, #bitcoin_abc

Reviewed By: bytesofman, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D12061