Invoke relayout after the IME became drawn

With the change in [1], we only set server visibility for the IME, when
it is actually drawn and store the last drawn state of the IME. If it is
currently not drawn (rotation), server visibility will be reset.
However, in some cases, a window layout has to be performed after the
IME became (server) visible, which is added by this CL.

[1]: Ifc0d345633b1aede56cf9ca8b2517c051e7359c6

Bug: 420218955
Bug: 425538294
Test: atest KeyboardVisibilityControlTest#testDialogPositionChangedAfterImeIsShown
Flag: EXEMPT Bugfix
Change-Id: Ibbc76dc7f3963e6c2fa1b7f15208fc69b2c8e1b5