Fix unexpected use of new code when in legacy mode

Flag: ACONFIG com.android.systemui.notifications_icon_container_refactor
DEVELOPMENT
Bug: 278765923
Test: atest SystemUITests

Change-Id: Ib5f083f5673daf991f550ffbee56bd224544c63e

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

@@ -481,7 +481,7 @@ public class LegacyNotificationIconAreaControllerImpl implements
             hostLayout.addView(expected, i);
         }
         hostLayout.setChangingViewPositions(false);
-        hostLayout.setReplacingIcons(null);
+        hostLayout.setReplacingIconsLegacy(null);
     }
 
     /**