fix(eww): inject the User-Agent reliably under byte-compilation

eww-config.el is lexical-binding and the User-Agent advice let-binds url.el's url-request-extra-headers, but the file never declared it special. The byte-compiler then bound it lexically, so the injected header never reached url-retrieve and the desktop User-Agent silently dropped in compiled production (eww kept working, just with the default UA). A top-level (defvar url-request-extra-headers) makes the compiler treat it as dynamic so the binding propagates. The advice tests, which exercise the compiled path, now pass.

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