Revert "Update cell drop visualizer radius"

This reverts commit 77e0faa670a39ec6a04d580bfb928ff672ca0434.

Reason for revert: Causes a 100% failing test see b/314206230

Change-Id: Icfc5bb4bace17b630bfd74a1460f6d1748d8d9d3
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index 3672fee..6c9a238 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -432,7 +432,7 @@
     <dimen name="split_instructions_bottom_margin_phone_portrait">60dp</dimen>
 
     <!-- Workspace grid visualization parameters -->
-    <dimen name="grid_visualization_rounding_radius">16dp</dimen>
+    <dimen name="grid_visualization_rounding_radius">28dp</dimen>
     <dimen name="grid_visualization_horizontal_cell_spacing">6dp</dimen>
     <dimen name="grid_visualization_vertical_cell_spacing">6dp</dimen>