Deselect the remove button when the remove dialog is dismissed

Video: https://drive.google.com/file/d/1RZY6GU1FAi95mHIO5XIFEuYr_pc2yKQz/view?usp=sharing

Test: Manually
Bug: 160131566
Change-Id: I5694c7941d8189acb9eab9d83126346d9243cdc6
diff --git a/src/com/android/wallpaper/picker/LivePreviewFragment.java b/src/com/android/wallpaper/picker/LivePreviewFragment.java
index 4d0d54a..067e941 100644
--- a/src/com/android/wallpaper/picker/LivePreviewFragment.java
+++ b/src/com/android/wallpaper/picker/LivePreviewFragment.java
@@ -569,6 +569,7 @@
     private void showDeleteConfirmDialog() {
         final AlertDialog alertDialog = new AlertDialog.Builder(getContext())
                 .setMessage(R.string.delete_wallpaper_confirmation)
+                .setOnDismissListener(dialog -> mBottomActionBar.deselectAction(DELETE))
                 .setPositiveButton(R.string.delete_live_wallpaper,
                         (dialog, which) -> deleteLiveWallpaper())
                 .setNegativeButton(android.R.string.cancel, null /* listener */)