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vcl_cookies: standardize on X-Orig-Cookie

Authored by BBlack.

Description

vcl_cookies: standardize on X-Orig-Cookie

Text was using Orig-Cookie and mobile was using X-Orig-Cookie for
basically identical purposes, so this aligns the two on
X-Orig-Cookie. Note that in the text case (the one changing to
align), the Orig-Cookie header is deleted in beresp for pass/miss
cases, so there's no chance of MW-level code having been exposed
to it or noticing the change.

Bug: T109286
Change-Id: I8fc6becbe781914344c2980d55dfb6c669bd8f1c