Replace "host" with "hostname" in goog.url type `UrlPrimitivePartsPartial`.
Replace "host" with "hostname" in goog.url type `UrlPrimitivePartsPartial`.

`createUrl()` only copies "hostname", ignoring "host". The unit tests already used "hostname", so no test changes required.

RELNOTES: Type fix in goog.url#createUrl
PiperOrigin-RevId: 328992000

google/closure-library,google/closure-library,google/closure-library,google/closure-library,google/closure-library