Ignore exception when checking isRotationLocked()

- RotationPolicy (a fw helper class) uses the current user to resolve
  the system setting for whether rotation is currently locked.  However,
  Launcher uses this class and does not hold the INTERACT_ACROSS_USERS
  permission, which means that immediately following a user switch, there
  is a brief window between ActivityManager setting the current user
  and Launcher being notified that the user is changing (so it can
  unregister the rotation watcher).  In this brief window, the Launcher
  for the outgoing user receiving a rotation signal will try to call
  this check and fail with a SecurityException.

  Longer term, we should refactor this to support a non-current user
  path for Launcher.

Bug: 279561841
Test: Manual

Change-Id: I7ce869d8388081af53751226b22f018d45ec2de8