Fix correctly recycle AccessibilityWindow in A11yController

Before this CL, it recycles A11yWindow that were added to |window| list,
which are visible windows only. Other windows are unrecycled.

This fixes to correctly recycle all windows.

Bug: None
Test: atest CtsAccessibilityTestCases CtsAccessibilityServiceTestCases
Change-Id: I48992bc76af29cb5515a82b5d0c5f3fc007804dc