Remove unused checkForUpdates() JS function

Author: delphidabbler

Src/Res/Scripts/external.js

@@ -85,15 +85,6 @@ function showNews() {
   return false;
 }
 
-/*
- * Calls external object to get host application to check for program updates.
- *  @return False.
- */
-function checkForUpdates() {
-  external.CheckForUpdates();
-  return false;
-}
-
 /*
  * Calls external object to get host application to display About box.
  *  @return False,