Fix racing for mIsFromTransactionItem

We shouldn't update the field in insetsControlChanged until the
insetsControlChangedItem flag is launched.

Bug: 347385364
Test: InputMethodServiceTest
Flag: com.android.window.flags.insets_control_changed_item
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:c6924b1cfc1b2b968d4c1178417860eb8ae8f294)
Merged-In: I7eb09a288a5668e49b78f7e93c1907ed77fe1b1f
Change-Id: I7eb09a288a5668e49b78f7e93c1907ed77fe1b1f