Disable strictmode leak detection

It doesn't work; the check was enabled by mistake.

Test: presubmit
Bug: 185786290
Change-Id: Ie049f1d6d7cef5acfa3ee29b5f9e9586fbeb24a5

tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java

@@ -115,7 +115,6 @@ public abstract class AbstractLauncherUiTest {
         if (TestHelpers.isInLauncherProcess()) {
             StrictMode.VmPolicy.Builder builder =
                     new StrictMode.VmPolicy.Builder()
-                            .detectActivityLeaks()
                             .penaltyLog()
                             .penaltyListener(Runnable::run, violation -> {
                                 if (sStrictmodeDetectedActivityLeak == null) {