Support enable window magnification without animation

To extend the magnification API to window magnification mode,
we support enabling the window magnification without animation.
Besides, we also disable the window magnification if the given scale
is less than or equal to 1.0f.

For the screen off scenario, we change to disable the window
magnification without animation.

Bug: 204844820
Test: atest com.android.systemui.accessibility
      atest com.android.server.accessibility.magnification
Change-Id: I8a35492776f08ecee353f035a94a16fec8e61218