Prevent tree-shaking tag/ID selectors for amp-lightbox-gallery #3226
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Addresses issue #4595.
This PR prevents that tree-shaking from happening, but it's not clear yet whether this element should be styled in the first place, since the docs page does not provide any Styling guidance as do other components' docs pages.
Nevertheless, it is likely that there could be other components that behave similarly, and so the tree shaker should still be extended to guard against removal of style rules for dynamically-added elements and IDs.
Build for testing: amp.zip - v1.3-alpha-20190911T183957Z-2ca646fa