Fix sizing of pattern view

Align the size of pattern view in ChooseLockPattern,
ConfirmLockPattern, and keyguard as much as possible.
In rare cases they may still be inconsistent because
the screens have different content outside of the
pattern view (e.g. header text, navigation buttons etc)

Test: Manual
Bug: 64339681
Change-Id: Ie07ae211340967a3cdf9c6c28f9818f207dbd2c9