[Apps][Examples] Remove chronik url input arg from getDetailsFromTxid

Summary: As per feedback from D14166, removing the chronik url input arg

Test Plan:
npm test
npm run getDetailsFromTxid <txid>

Reviewers: bytesofman, #bitcoin_abc

Reviewed By: bytesofman, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D14183