[CrOS Settings] Add screenshot for "Screen lock password" string

This will help translators come up with an appropriate localized string
in their languages.

Bug: b/158612775
Change-Id: I807363055ffe36d1416a9f92e0a12a1e28160612
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252843Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Commit-Queue: Regan Hsu <hsuregan@chromium.org>
Auto-Submit: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779994}

chrome/app/os_settings_search_tag_strings_grdp/IDS_OS_SETTINGS_TAG_LOCK_SCREEN_PIN_OR_PASSWORD_ALT1.png.sha1

+8ab28dc8feb16c1a9116e108b4229dbcef3aa1d6
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