Enable visual feedback when entering FRP pattern

When the original lock pattern is verified for Factory Reset Protection
(FRP), the original setting of LOCK_PATTERN_VISIBLE is unknown.
However, it's likely to be true, since that is the value that gets set
automatically when a pattern is first set.  It would only be false if
the user went into Settings and disabled "Make pattern visible".  So, to
be consistent with this, fix the low-level default to be true instead of
false.  This enables visual feedback when entering the FRP pattern.

Bug: 270013005
Change-Id: If295999da34510c17ebfb323dd5215418eaa0852