Attempt to workaround a leak on Taimen

It's a flake.
It was likely caused by enabling fallback tests, and we don't know
what's leaked and why.

Bug: 143488140
Change-Id: I0d0c88ac9b0de316861f16ba023a596c1f39cde4
diff --git a/quickstep/tests/src/com/android/quickstep/FallbackRecentsTest.java b/quickstep/tests/src/com/android/quickstep/FallbackRecentsTest.java
index a343e7c..ffe55b6 100644
--- a/quickstep/tests/src/com/android/quickstep/FallbackRecentsTest.java
+++ b/quickstep/tests/src/com/android/quickstep/FallbackRecentsTest.java
@@ -120,6 +120,8 @@
                     TestCommandReceiver.callCommand(TestCommandReceiver.DISABLE_TEST_LAUNCHER);
                     UiDevice.getInstance(getInstrumentation()).executeShellCommand(
                             getLauncherCommand(getLauncherInMyProcess()));
+                    // b/143488140
+                    mLauncher.pressHome();
                 }
             }
         };