Revert "Increase bit depth for Silicon barrel y position."

This reverts commit 78e317ee

compact/central_tracker.xml

@@ -426,7 +426,7 @@
   <readouts>
     <readout name="TrackerBarrelHits">
       <segmentation type="CartesianGridXY" grid_size_x="0.010*mm" grid_size_y="0.010*mm" />
-      <id>system:8,barrel:2,layer:4,module:12,sensor:2,x:34:-16,y:-18</id>
+      <id>system:8,barrel:2,layer:4,module:12,sensor:2,x:32:-16,y:-16</id>
     </readout>
     <readout name="TrackerEndcapHits">
       <segmentation type="CartesianGridXZ" grid_size_x="0.010*mm" grid_size_z="0.010*mm" />