Fix One-handed tutorial looks janky on entering transition

According to systrace, one-handed-tutorial-overlay got
jank problem(SurfaceFlinger GPU Deadline Missed,
App Deadline Missed, Buffer stuffing).

1.setLayerType(LAYER_TYPE_HARDWARE) when create targetViewContainer
  setLayerType(LAYER_TYPE_NONE) when removeTutorialFromWindowManager
2.Rename isShowing() to isAttached()
3.Remove redundant float casting
4.Remove redundant increment param

Test: manual trigger OHM
Test: atest WMShellUnitTests
Bug: 193589897
Change-Id: Ieec397795b46dee9ca04375bfc26b09441688d08