Mark the card as no clickable if no listener

Avoid Talkback suggesting double tap to activate if there's
no click listener.

Bug: 140544394
Change-Id: Iea67f592a006382e55d1557c6be02259282524e0
diff --git a/src/com/android/customization/picker/theme/ThemePreviewPage.java b/src/com/android/customization/picker/theme/ThemePreviewPage.java
index 0543b24..c3af91c 100644
--- a/src/com/android/customization/picker/theme/ThemePreviewPage.java
+++ b/src/com/android/customization/picker/theme/ThemePreviewPage.java
@@ -220,6 +220,8 @@
             TextView editLabel = card.findViewById(R.id.edit_label);
             editLabel.setOnClickListener(mEditClickListener);
             card.setOnClickListener(mEditClickListener);
+            card.setClickable(mEditClickListener != null);
+
             editLabel.setVisibility(mEditClickListener != null
                     ? View.VISIBLE : View.INVISIBLE);