[explorer] Hide the advanced transaction data by default
Summary: This contains the tx hex which can be very large and makes navigation more complicated.
Test Plan:
cargo run
Open any transaction page and check the advanced block is now an accordion and folded by default.
Reviewers: #bitcoin_abc, PiRK
Reviewed By: #bitcoin_abc, PiRK
Differential Revision: https://reviews.bitcoinabc.org/D17893