WebUI: Move fingerprint progress arc to settings

cr-fingerprint-progress-arc is only used by the Settings privacy page.
Move it there, since it is not sufficiently general-purpose for
cr_elements.

Bug: None
Change-Id: I289093e18e4c19df1edfe391cc5bde68d92f1092
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5335897


Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1267376}