Options: Pass the `$passed_default` parameter to the...

Options: Pass the `$passed_default` parameter to the `'default_option_{$option}` filter in `add_option()`.

This was missed in [38910].

Props joehoyle, lucasstark.
See #38176.
Fixes #38930.
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git-svn-id: https://core.svn.wordpress.org/trunk@39322 1a063a9b-81f0-0310-95a4-ce76da25c4cd