Fix UI error after upload when share link is too long

The QR-code generation logic had a character limit. This broke the
upload page when the share URL is too long. This has now been fixed to
support an arbitrary number of characters.

Fixes https://gitlab.com/timvisee/send/-/issues/19

app/ui/qr.js

@@ -2,7 +2,7 @@ const raw = require('choo/html/raw');
 const qrcode = require('../qrcode');
 
 module.exports = function(url) {
-  const gen = qrcode(5, 'L');
+  const gen = qrcode(0, 'L');
   gen.addData(url);
   gen.make();
   const qr = gen.createSvgTag({ scalable: true });