[Autofill Framework] Change ignore view state reset to empty flag

default to true

Also removed the obsolete aconfig to help reduce confusion when reading
flag value in bug report.

Autofill CTS module passes except one known failure: https://android-build.corp.google.com/test_investigate/?invocationId=I36900010278063591

Bug: b/341329582
Test: atest CtsAutofillServiceTestCases
Change-Id: I7210c7e3d4aa468235280943bc3a287265ef064c