Include recommended widgets table vertical padding in the height estimation

Test: run AddWidgetTest, AddConfigWidgetTest
Bug: 186450511
Change-Id: If306b569058edb3edb3c741199e9c0d96a88f412
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index 8a160bd..600a550 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -118,6 +118,7 @@
     <dimen name="widget_cell_horizontal_padding">16dp</dimen>
     <dimen name="widget_cell_font_size">14sp</dimen>
 
+    <dimen name="recommended_widgets_table_vertical_padding">8dp</dimen>
 
     <dimen name="widget_list_top_bottom_corner_radius">28dp</dimen>
     <dimen name="widget_list_content_corner_radius">4dp</dimen>