use brand link color for attachments in the admin support page

www/admin/app-admin.less

@@ -120,6 +120,12 @@
             .cp-support-showdata {
                 background-color: lighten(@cp_admin-last-bg, 5%);
             }
+            .cp-support-attachments {
+                a {
+                    color: @cryptpad_color_link;
+                    text-decoration: underline;
+                }
+            }
             &:last-child:not(.cp-support-fromadmin)  {
                 color: @cp_admin-last-fg;
                 background-color: @cp_admin-last-bg;