[alias-serve] Replace utils address function with now-available ecashaddrjs function

Summary:
T3060

This function has been built out into ecashaddrjs due to popular use in apps working with chronik and tx parsing.

Test Plan:
grep -r outputScriptToAddress . and no output other than perhaps cached node_modules/
npm test still passes with replaced function

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D13566