Fix crash caused by double loading of widget previews

Bug: 8146408
diff --git a/src/com/android/launcher2/AppsCustomizePagedView.java b/src/com/android/launcher2/AppsCustomizePagedView.java
index 82d595b..4ff799f 100644
--- a/src/com/android/launcher2/AppsCustomizePagedView.java
+++ b/src/com/android/launcher2/AppsCustomizePagedView.java
@@ -1242,6 +1242,7 @@
                                 maxPreviewWidth, maxPreviewHeight, mWidgetCountX);
                     }
                 }
+                layout.setOnLayoutListener(null);
             }
         });
     }