fix organisation item in list safari

assets/sass/_theme/sections/organizations.sass

@@ -8,9 +8,11 @@
             text-decoration: none
     .media
         background: $color-background-alt
-        aspect-ratio: 1/1
         padding: $spacing1
         margin-bottom: half($spacing0)
+        picture
+            aspect-ratio: 1/1
+            display: block
         img
             width: 100%
             height: 100%