fix($sceDelegate): make `resourceUrlWhitelist()` is identical `trustedResourceUrlList()`

In commit a206e2675c351c3cdcde, `$sceDelegateProvider`'s
`resourceUrlWhitelist()` was deprecated in favor of the new
`trustedResourceUrlList()`. However, although both properties were
assigned the same value, it was possible for an app to break if one of
the properties was overwritten in one part of the app (or a 3rd-party
library) while another part of the app interacts with the other,
non-overwritten property.

This commit fixes it by making `resourceUrlWhitelist()` a getter/setter
that delegates to `trustedResourceUrlList()`, ensuring that the two
properties will remain in sync. This, also, makes it consistent with
other similar deprecated properties, such as `$sceDelegateProvider`'s
`resourceUrlBlacklist()`.

Closes #17090