css: add padding in rooms list

src/plugins/roomslist/styles/roomsgroups.scss

@@ -26,6 +26,7 @@
                     flex-direction: row;
                     line-height: 1.5em;
                     height: 2.5em;
+                    padding: 0.2em 0;
                     span {
                         overflow-x: hidden;
                         text-overflow: ellipsis;