Do not ignore overlays.xml with previous versions (3, 4)

... after version upgrade to 5 (because this version upgrade
is not a breaking change).

Test: atest OverlayManagerSettingsTests
Bug: 397939752
Flag: EXEMPT bugfix
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:953a29f5ca6b33e37c58d8bb765d6a20f9555aa7)
Merged-In: I13ddd37e6d27fe95323c845b4a6074a3a3c9415f
Change-Id: I13ddd37e6d27fe95323c845b4a6074a3a3c9415f