Fix idsite html attribute is not set in SitesManager

plugins/SitesManager/templates/sites-list/site-fields.html

-<div class="site card hoverable" idsite="{{site.idSite}}" ng-class="{'editingSite': site.editMode==true}">
+<div class="site card hoverable" idsite="{{ site.idsite }}" ng-class="{'editingSite': site.editMode==true}">
 <div class="card-content">
 
     <div class="row" ng-if="!site.editMode">