Update list.php

to save the town filtre on prospect list, just i replace: 
$param='&amp;stcomm='.$stcomm.'&amp;search_nom='.urlencode($search_nom).'&amp;search_zipcode='.urlencode($search_zipcode).'&amp;search_ville ='.urlencode($search_ville );

search_ville by search_town
Merge pull request #1468 from bouna/patch-1

Update list.php
Merge remote-tracking branch 'origin/3.4' into 3.5
Merge remote-tracking branch 'origin/3.5' into 3.5_backported