Enables following typing functionality when the window magnifier is on again.

There are 3 conditions that we have to reset the tracking typing focus
state to on.

1. IME is shown again. (It already exists.)
2. A user re-enable a window magnifier.
3. A user switch to a window magnifier from a full-screen magnifier.

In this CL, we add the 2nd and 3rd condition to turn on this
functionality in a window magnifier.

Bug: 216394179
Test: atest WindowMagnificationManagerTest
Change-Id: I78ca62b00559c242d5562f4247e3854e8386a512