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Fixes the issue when the user does not have the stored hour clock type
preference - it uses the previous user preference.

Bug: b/168759134
Change-Id: I415b85456dd578ac0565b42c819ef9d0b3590d94
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443009Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Auto-Submit: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816633}