Script Loader: Fix metadata being registered as an inline script.

[43723] included script metadata for the `wp-polyfill` script that was being registered as an inline script.

Merges [43802] from the 5.0 branch to trunk.

See #45065.


Built from https://develop.svn.wordpress.org/trunk@44143


git-svn-id: https://core.svn.wordpress.org/trunk@43973 1a063a9b-81f0-0310-95a4-ce76da25c4cd