OHIF-328 up/down arrows keys on SR viewport. (#1922)

* Fix arrow key scroll on SR Viewport.

* Remove debuggers

extensions/cornerstone/src/init.js

@@ -153,8 +153,8 @@ export default function init({ servicesManager, configuration }) {
       },
     },
     DragProbe: {
-      defaultStrategy: 'minimal'
-    }
+      defaultStrategy: 'minimal',
+    },
   };
 
   /* Abstract tools configuration using extension configuration. */