Fix: Switch function to check asset optin due to wallets that have over 1000 assets

[atrefonas]

ℹ Overview

The current API used doesn't work for wallets with over 1000 assets.

See this PR which fixes it for Algodex Mailbox algodex/algodex-mailbox#263

For example these wallets on Mainnet:
LWT6235B2XIVC3BB4ENQGD72S3QE5JJCWOZAUPBJ2PXPZGCAMXPFIG5UCM
XBOMMMEOIUWEOPDKT4T5AVZY7F52X25GVKW2B4COREGMNYCLQ2GHFOUOM4

From algoexplorer:

"We recommend dApps to simply use our indexer to fetch >1000 assets
Base URL: https://indexer.algoexplorerapi.io
Endpoint: GET /v2/accounts/{account-id}/assets"

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