Not deleting assistant from sources

Now it's done via test config files

Change-Id: Ia31f6de8a44ce29b1ccc01fdb509b6d1e8f2d49d

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

@@ -102,10 +102,6 @@ public abstract class AbstractLauncherUiTest {
         }
         if (TestHelpers.isInLauncherProcess()) Utilities.enableRunningInTestHarnessForTests();
         mLauncher = new LauncherInstrumentation(instrumentation);
-        try {
-            mDevice.executeShellCommand("settings delete secure assistant");
-        } catch (IOException e) {
-        }
     }
 
     @Rule