Unlock the phone before each test

We were trying to do so from the test config, but this didn't work

Change-Id: I098eb392c76572bc43443adac130fa8700b49bde

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

@@ -163,6 +163,8 @@ public abstract class AbstractLauncherUiTest {
     public void setUp() throws Exception {
         mTargetContext = InstrumentationRegistry.getTargetContext();
         mTargetPackage = mTargetContext.getPackageName();
+        // Unlock the phone
+        mDevice.executeShellCommand("input keyevent 82");
     }
 
     @After