[explorer] Lint the explorer

Summary: This undo some of the formatting from older prettier versions.

Test Plan:

arc lint -- web/explorer/explorer-server/templates/pages/*

Check your linter agrees with mine.

Reviewers: #bitcoin_abc, bytesofman

Reviewed By: #bitcoin_abc, bytesofman

Subscribers: bytesofman

Differential Revision: https://reviews.bitcoinabc.org/D13834