Use own context instead of app context to get overlay resources

Bug: 129270535
Test: adb shell am instrument -w -r -e package android.platform.test.scenario.launcher android.platform.test.scenario/androidx.test.runner.AndroidJUnitRunner
Change-Id: Iff2921cafcdb933566b5eb76670facc844bc7fd9
(cherry picked from commit 15179c0674b2cd20c252205673b338300b4fa48c)
1 file changed