QRCODE: fix qr_in_alpha() uneven percent check to be gs1 only,

causing incorrect mode costings leading to version 40 `binlen`
  < lower version, triggering assert, ticket #300 (#15), props
  Andre Maute

docs/templates/styles.html

@@ -217,6 +217,9 @@ td {
   padding: 0.125em 0.5em 0.25em 0.5em;
   vertical-align: top;
 }
+tbody tr:first-child td {
+ padding-top: 0.5em;
+}
 header {
   margin-bottom: 4em;
   text-align: center;