Component updater: report the correct updater state for per-system O4.

This CL changes the code behavior for Windows x86-64 builds of Google
Chrome.

Because Chrome ships with an x86 updater on Windows, the updater state
must be picked up from DIR_PROGRAM_FILESX86 regardless of the
architecture of the browser.

Fixed: 1444209
Change-Id: I58b34ef641e2e1be5311986ffb90607f7e027772
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4518244
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Auto-Submit: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1141786}