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Switches the browser used by the Windows XR perf tests from "release" to
"release_x64" since the bot was changed to 64-bit and Telemetry is
now failing to find the 32-bit browser that is requested.

TBR=ynovikov@chromium.org

Bug: 988833
Change-Id: I498e65f1ac4182718ccf83495d6ff1eb3eacbe73
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1735553Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684078}