Add mInputFilterEnabled to dump

The variable mInputFilterEnabled determines whether the input events
will first go to an input filter before being sent to the application.
Add a dump of this variable to InputDispatcher state in order to make it
easier to debug input-related issues.

Bug: 130886239
Test: dumpsys input
Change-Id: I30fe2ceea6c659edb5fad0da81400c8ce9674d99