Fixing the segmentation (NoSegmentation) for the crystal cal

Since each block has its own volume, there is no need for segmentation. @jihee.kim, maybe we want to rethink the construction (we can talk about it separately).

This is also part of the x-tal cal digitization fix.

topside/ecal.xml

@@ -171,8 +171,8 @@
   <!--  Definition of the readout segmentation/definition  -->
   <readouts>
     <readout name="CrystalEcalHits">
-      <segmentation type="CartesianGridXY" grid_size_x="20.0*mm" grid_size_y="20.0*mm" />
-      <id>system:8,sector:4,module:20,x:48:-8,y:-8</id>
+      <segmentation type="NoSegmentation" />
+      <id>system:8,sector:4,module:20</id>
     </readout>
     <readout name="EcalBarrelHits">
       <segmentation type="CartesianGridXY" grid_size_x="3.5 * mm" grid_size_y="3.5 * mm"/>