Fix stylus hover inits InkWindow

InkWindow is init first time handwriing capable IME is binded but never after that. We should set the
initializer after every bind so that we can init the InkWindow for
next stylus onHover.

Fixing this should help with reducing initiation latency for both focused and unfocused editors.

Fix: 289119709
Bug: 287109569

Test: atest StylusHandwritingTest

Change-Id: Ic921b350525b6e6b35f5946e51e506d40e3ba335