camera: Skip ignored camera IDs when switching

   - On tetris, camera IDs 2 & 3 (logical lenses shown as physical) are ignored.
   - This hides extra "Lens" options in the camera app UI.
   - However, camera switching still cycles through these ignored IDs because isMultiCamEnabled() returns false.
   - This happens because multi_same_facing is false when only
     one front_camera_ids & back_camera_ids remain after ignoring, so multi-cam mode is disabled.