Update gesture navigation tutorial.

- Updated gesture navigation feedback videos.
- Added feedback motion loop videos.
- Updated strings.
- Added alternate strings for when the user launches tutorial steps from the Tips app.

Test: manual
bug: 169687177
Change-Id: I87d475e1510a25ffefea14dbd0b224a063e7cad8

src/com/android/launcher3/settings/DeveloperOptionsFragment.java

@@ -277,8 +277,8 @@ public class DeveloperOptionsFragment extends PreferenceFragmentCompat {
             startActivity(launchSandboxIntent.putExtra(
                     "tutorial_steps",
                     new String[] {
-                            "LEFT_EDGE_BACK_NAVIGATION",
                             "HOME_NAVIGATION",
+                            "LEFT_EDGE_BACK_NAVIGATION",
                             "OVERVIEW_NAVIGATION"}));
             return true;
         });