Merge pull request #1331 from Bilb/fix-group-panel-with-plenty-media

fix the media panel with lots of media (bottom button hidden)

stylesheets/_modules.scss

@@ -1318,7 +1318,7 @@
   flex-direction: column;
   flex-grow: 1;
   width: 100%;
-  height: 100%;
+  overflow: hidden;
 }
 
 .module-media-gallery__tab-container {

stylesheets/_session_group_panel.scss

@@ -151,6 +151,7 @@
             22vw / 3.5
           ); //.group-settings is 22vw and we want three rows with some space so divide it by 3.5
           margin: auto;
+          margin-bottom: 1vh;
         }
       }
     }