Restore drag&drop from WidgetsBottomSheet

Fix: 184917820
Test: By hand with various widgets
Change-Id: I488b960daaa83c38aa1bd3cac5b94767ff656103
diff --git a/src/com/android/launcher3/widget/WidgetsBottomSheet.java b/src/com/android/launcher3/widget/WidgetsBottomSheet.java
index bbb0d92..0670928 100644
--- a/src/com/android/launcher3/widget/WidgetsBottomSheet.java
+++ b/src/com/android/launcher3/widget/WidgetsBottomSheet.java
@@ -170,9 +170,9 @@
         WidgetCell widget = (WidgetCell) LayoutInflater.from(getContext())
                 .inflate(R.layout.widget_cell, parent, false);
 
-        WidgetImageView preview = widget.findViewById(R.id.widget_preview);
-        preview.setOnClickListener(this);
-        preview.setOnLongClickListener(this);
+        View preview_container = widget.findViewById(R.id.widget_preview_container);
+        preview_container.setOnClickListener(this);
+        preview_container.setOnLongClickListener(this);
         widget.setAnimatePreview(false);
 
         parent.addView(widget);