Fix InlineFilteringTest#testFiltering_filtersByPrefix

The window matrix of the embedded window is not updated if the second
host SurfaceView  doesn't have any offset. To esnure the window matrix
is up-to-date, we force to update the matrix when the embedded hierarchy
is initialized.

Bug: 229178859
Test: atest InlineFilteringTest#testFiltering_filtersByPrefix
      atest android.accessibilityservice.cts
Change-Id: Ib23af520fcbaa1788e3ef22a1086b90a0801375c