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Changed the pin keyboard to match the specs at https://folio.googleplex.com/cros-core-ui/spec#%2F5.1%20-%20Start%20screen%20Pin%20lock%20pods.png%3Fz=width, minus the submit button on the normal pod and the errors on the pin keyboard.

BUG=627222
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2222583002
Cr-Commit-Position: refs/heads/master@{#414858}