[web] fix mailbox badge height

Signed-off-by: Kristian Feldsam <feldsam@gmail.com>

data/web/css/site/mailbox.css

@@ -66,4 +66,6 @@ table tbody tr td input[type="checkbox"] {
   padding: .2em .4em .3em !important;
   background-color: #ececec!important;
 }
-
+.badge.bg-info .bi {
+  font-size: inherit;
+}