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In the in-session auth dialog, show PIN view only if PIN is set, and
show fingerprint view only if fingerprint is set.

      icon are not shown. Delete PIN, verify that PIN pad is not shown.

Bug: b:156258540
Test: On Nami, delete fingerprint, verify that fingerprint prompt and
Change-Id: I55604aeb9e66f04a2f49ffbb5e5160b6158a40d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2351120
Commit-Queue: Yicheng Li <yichengli@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797721}