Fixes AOSP crash when WPP isn't installed.

If there is no installed application with the ability to start an
activity with the SET_WALLPAPER action, we no longer show the
"Shortcuts" entry under the "Display > Lock screen" settings page.

Flag: CUSTOMIZABLE_LOCK_SCREEN_QUICK_AFFORDANCES
Fix: 274075866
Test: expanded unit test
Test: manually verified that, if Intent.resolveActivity returns false,
the shortcuts item isn't present in settings.

Change-Id: I919427d1e71a88a520c762307029a53065a68f46

src/com/android/settings/display/CustomizableLockScreenQuickAffordancesPreferenceController.java

@@ -50,7 +50,7 @@ public class CustomizableLockScreenQuickAffordancesPreferenceController extends
         final Preference preference = screen.findPreference(getPreferenceKey());
         if (preference != null) {
             preference.setOnPreferenceClickListener(preference1 -> {
-                final Intent intent = new Intent(Intent.ACTION_SET_WALLPAPER);
+                final Intent intent = CustomizableLockScreenUtils.newIntent();
                 final String packageName =
                         mContext.getString(R.string.config_wallpaper_picker_package);
                 if (!TextUtils.isEmpty(packageName)) {