Alan Agius d50a2fef2f fix(@schematics/angular): use ES2016 as syntax target for server bundles
The supported versions of Node.js support up to ES2018, the only reason why we don't use ES2017+ is because native `async` and `await` don't work with zone.js

See: https://github.com/angular/angular/issues/31730

With this change, we also ensure that we don't downlevel the server bundle to ES5 which is unnecessary.

Closes: #17794
2020-06-01 14:53:37 -04:00
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