Hide the other preview when entering the secondary screen (2/2)

When on the secondary screen, we should hide the other screen.

Test: Manully tested. See bug.
Bug: 398909183
Flag: com.android.systemui.shared.new_customization_picker_ui
Change-Id: Iaf8a5cb545a45b566467883349188039b78b30df
diff --git a/src/com/android/wallpaper/customization/ui/binder/ThemePickerCustomizationOptionBinder.kt b/src/com/android/wallpaper/customization/ui/binder/ThemePickerCustomizationOptionBinder.kt
index 9ce7b61..7b78e8c 100644
--- a/src/com/android/wallpaper/customization/ui/binder/ThemePickerCustomizationOptionBinder.kt
+++ b/src/com/android/wallpaper/customization/ui/binder/ThemePickerCustomizationOptionBinder.kt
@@ -52,6 +52,7 @@
 import com.android.wallpaper.picker.customization.ui.binder.CustomizationOptionsBinder
 import com.android.wallpaper.picker.customization.ui.binder.DefaultCustomizationOptionsBinder
 import com.android.wallpaper.picker.customization.ui.util.CustomizationOptionUtil.CustomizationOption
+import com.android.wallpaper.picker.customization.ui.util.ViewAlphaAnimator.animateToAlpha
 import com.android.wallpaper.picker.customization.ui.viewmodel.ColorUpdateViewModel
 import com.android.wallpaper.picker.customization.ui.viewmodel.CustomizationOptionsViewModel
 import com.android.wallpaper.picker.customization.ui.viewmodel.CustomizationPickerViewModel2
@@ -476,6 +477,10 @@
                             clockViewFactory.updateFontAxes(clock.clockId, axisList)
                         }
                 }
+
+                launch {
+                    viewModel.lockPreviewAnimateToAlpha.collect { clockHostView.animateToAlpha(it) }
+                }
             }
         }
     }