Bug 38190: Remove JS error on suggestion page

Bug 38190: Remove JS error on suggestion page

This code could appear several time as we include it in modals

Test plan:
Go on http://localhost:8081/cgi-bin/koha/suggestion/suggestion.pl
Open the console
Notice that without this patch you see a JS error
  Uncaught SyntaxError: redeclaration of const av_bsort1
With this patch applied the error is gone.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>