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Fix a typo in the pin dialog error message which read
"1 attempts left" instead of "1 attempt left" when the user has
attempted incorrect pins and there's only 1 attempt remaining.

This CL is the second attempt to solve the issue after being
reverted in commit 7672be058caa26d14678f8b0d4a06de56c155309
due to an issue in the error message format of the SAML login.
The first attempt only handled the normal login while this one
handles both the SAML login and the normal login.

Bug: 1060695
Change-Id: Ieac135c90ef6e20cf53bd26d2ab87cf0147c21a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2599814
Commit-Queue: Aya Nader Elgendy‎ <ayag@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841990}