Fix broken test on GSI branch

Both com.android.apex.cts.shim.v2_prebuilt and StagedInstallTestApexV2
provide the same artifact. Tests that are using StagedInstallTestApexV2
are passing, whereas tests using com.android.apex.cts.shim.v2_prebuilt
are failing.

Root cause has not been identified yet. Proactively swapping the targets
to get the test green.

Bug: 200737517
Test: atest StagedInstallInternalTest#testAdbStagedReadyWaitCanBeSkipped
Change-Id: Ibdd72ec062538838ad60b847ee1ff31a792520a3

tests/StagedInstallTest/Android.bp

@@ -54,7 +54,7 @@ java_test_host {
     ],
     data: [
         ":com.android.apex.apkrollback.test_v1",
-        ":com.android.apex.cts.shim.v2_prebuilt",
+        ":StagedInstallTestApexV2",
         ":StagedInstallTestApexV2_WrongSha",
         ":TestAppAv1",
         ":test.rebootless_apex_v1",