Sergey Biryukov e235883c4d HTTP API: Restore one instance of the X-Pingback header capitalization.
The revert in the previous commit appears to be accidental.

Follow-up to [55210], [55211].

See #54225.
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git-svn-id: http://core.svn.wordpress.org/trunk@54745 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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