Update array.js formatting

Mostly whitespace changes, to match with future change.

Autoformatted via prettier with settings below, this is so additional polyfill matches can be used to match formatting in future PRs for polyfills, as well as full formatting tooling for .js files.

tabWidth: 4
useTabs: true
singleQuote: true
trailingComma: "es5"

assigned to @echicken and unassigned @rswindell

merged

mentioned in commit 97c2ab4d