update-oojs.sh: Rewrite to fetch from npm repo instead of building from git
* Fetch upstream build from npm repository instead of building it locally
from git (to avoid different timestamps and checksums not matching, no
need for MediaWiki code to know how to build a oojs distribution).
* Ran it which changed the oojs.js file slightly (it now contains the file
as released on npmjs.org instead of the local build by the person who
last updated it in mediawiki).
Follows-up:
*
648667a - Split up resources/ into resources/lib/ and resources/src/
*
c68b967 - Add scripts to generate update builds of OOjs
Change-Id: I63f79293e21781c1db3d7c43658c22f58ba9102d