feature: notification - default avatar + styles added (bis)

src/views/circle/page-circle-notifications.pug

 solid-notifications-template(data-rdf-type='hd:circle')
   template
     .solid-notification__avatar
-      img(src="${await author['account.foaf:depiction'] || '/images/alien.svg'}" style=`max-height:${clientLogoHeight || '18px'}`)
+      img(src="${await author['account.foaf:depiction'] || '/images/alien.svg'}" style="${await author['account.foaf:depiction'] ? 'max-height:100%' : 'max-height:18px'}")
     .solid-notification__content
       .solid-notification__title ${await author.name} 
         span.solid-notification__title__side dans 

src/views/user/page-user-notifications.pug

 solid-notifications-template(data-rdf-type='foaf:user')
   template
     .solid-notification__avatar
-      img(src="${await author['account.foaf:depiction'] || '/images/alien.svg'}" style=`max-height:${clientLogoHeight || '18px'}`)
+      img(src="${await author['account.foaf:depiction'] || '/images/alien.svg'}" style="${await author['account.foaf:depiction'] ? 'max-height:100%' : 'max-height:18px'}")
     .solid-notification__content
       .solid-notification__title ${await author.name} 
         span.solid-notification__title__side en privé