lower wireguard qr ecc level to support real wg conf

templates/lambdainst/wireguard.html

@@ -102,6 +102,7 @@
                 height: 256,
                 colorDark: "#000000",
                 colorLight: "#ffffff",
+                correctLevel: QRErrorCorrectLevel.M
             });
         });
         req.open("GET", url);