service2.js: Remove excessive markup repositioning

When window scrolls, our host element, correction panel and status icon
don't change their (left, top, right, bottom) document coordinates.

service2.js

@@ -9,10 +9,6 @@
  */
 let besServices = []
 
-window.addEventListener('scroll', () =>
-  besServices.forEach(service => service.onScroll())
-)
-
 /*************************************************************************
  *
  * Base class for all grammar-checking services