fix(angularInit): allow auto-bootstraping from inline script

Some browsers (e.g. Safari 9.x, PhantomJS) do not set `link.origin/protocol`
correctly, when setting `link.href` to `null`, which prevented auto-bootstraping
Angular from scripts without a `src` attribute (i.e. inline scripts).
Inline scripts are on the same origin as the loading page, so auto-bootstraping
should be allowed.

Fixes #15567

Closes #15571