Fix a crash on the lock screen wallet icon.

Setting image drawable on the wallet button should be in UI thread.

Test: manual
Bug: 232969910
Change-Id: If25ef2270845074b122245be3a45f8e5080356ce

packages/SystemUI/src/com/android/systemui/statusbar/phone/KeyguardBottomAreaView.java

@@ -1195,10 +1195,10 @@ public class KeyguardBottomAreaView extends FrameLayout implements View.OnClickL
         public void onWalletCardsRetrieved(@NonNull GetWalletCardsResponse response) {
             mHasCard = !response.getWalletCards().isEmpty();
             Drawable tileIcon = mQuickAccessWalletController.getWalletClient().getTileIcon();
-            if (tileIcon != null) {
-                mWalletButton.setImageDrawable(tileIcon);
-            }
             post(() -> {
+                if (tileIcon != null) {
+                    mWalletButton.setImageDrawable(tileIcon);
+                }
                 updateWalletVisibility();
                 updateAffordanceColors();
             });