Bind BottomActionBar#cancel button to backkey

So that the behavior of cancel button and backkey would be same.

Test: Manually
Bug: 151287994
Change-Id: I3634a6e8dc2cb9b818e5aaebb8cd359a641e619e
diff --git a/src/com/android/customization/picker/CustomizationPickerActivity.java b/src/com/android/customization/picker/CustomizationPickerActivity.java
index c3b3057..0dde0eb 100644
--- a/src/com/android/customization/picker/CustomizationPickerActivity.java
+++ b/src/com/android/customization/picker/CustomizationPickerActivity.java
@@ -291,17 +291,17 @@
 
     @Override
     public void onBackPressed() {
-        // For wallpaper tab, since it had child fragment.
-        if (mWallpaperCategoryFragment != null && mWallpaperCategoryFragment.popChildFragment()) {
-            return;
-        }
-
         Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.fragment_container);
         if (fragment instanceof BottomActionBarFragment
                 && ((BottomActionBarFragment) fragment).onBackPressed()) {
             return;
         }
 
+        // For wallpaper tab, since it had child fragment.
+        if (mWallpaperCategoryFragment != null && mWallpaperCategoryFragment.popChildFragment()) {
+            return;
+        }
+
         if (getSupportFragmentManager().popBackStackImmediate()) {
             return;
         }
diff --git a/src/com/android/customization/picker/grid/GridFragment.java b/src/com/android/customization/picker/grid/GridFragment.java
index 1a26755..eac1527 100644
--- a/src/com/android/customization/picker/grid/GridFragment.java
+++ b/src/com/android/customization/picker/grid/GridFragment.java
@@ -209,7 +209,6 @@
     protected void onBottomActionBarReady(BottomActionBar bottomActionBar) {
         mBottomActionBar = bottomActionBar;
         mBottomActionBar.showActionsOnly(CANCEL, APPLY);
-        mBottomActionBar.setActionClickListener(CANCEL, unused -> getActivity().onBackPressed());
         mBottomActionBar.setActionClickListener(APPLY, unused -> {
             mBottomActionBar.disableActions();
             mGridManager.apply(mSelectedOption, mApplyGridCallback);