Bug 34097: Prevent clicking ellipsis for dateaccessioned plugin from scrolling up

Test plan:
1. Find a record with several items (in ktd "MacLaren's Gaelic
   self-taught" will do nicely
2. Click the Edit button next to one of the items
3. Click the "..." to the right of "d - Date acquired" and verify that the
   page doesn't scroll up to the top, and that the current date is
   inserted in the field
4. Click the "..." to the right of "w - Price effective from" and verify
   that the page doesn't scroll up and the current date is inserted

Signed-off-by: Sam Lau <samalau@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>

cataloguing/value_builder/dateaccessioned.pl

@@ -45,6 +45,7 @@ function Focus$function_name(event) {
 
 function Click$function_name(event) {
     set_to_today(event.data.id, 1);
+    return false;
 }
 
 function set_to_today( id, force ) {