Fix compat change CTS test flakiness

Cleanup overrides in the PlatformCompatCommandNotInstalledTest test.

Test: atest PlatformCompatCommandNotInstalledTest
Test: adb shell dumpsys platform_compat | grep override # is empty
Bug: 169235095
Change-Id: Ibd9f2801e8b4c571dca49f0682a8bc3b17ffd545

tests/PlatformCompatGating/src/com/android/tests/gating/PlatformCompatCommandNotInstalledTest.kt

@@ -107,7 +107,10 @@ class PlatformCompatCommandNotInstalledTest {
     fun ParcelFileDescriptor.text() = FileReader(fileDescriptor).readText()
 
     @After
-    fun resetIdentity() = uiAutomation.dropShellPermissionIdentity()
+    fun resetChangeIdAndIdentity() {
+        command("am compat reset $TEST_CHANGE_ID $TEST_PKG")
+        uiAutomation.dropShellPermissionIdentity()
+    }
 
     @Test
     fun execute() {