[Cashtab] No double notifications for SLP partial lists

Summary: This was missed in the first pass of removing double notifications. Does not apply to ALP as ALP does not require the "ad prep tx" -- only SLP. NFT listing already has this handled.

Test Plan: npm test

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D17575