Hide verification QR code

The scannable fingerprint format has changed, leaving our qr codes out
of date and thus unscannable.

background.html

@@ -304,7 +304,7 @@
       {{ /has_their_key }}
       {{ #has_their_key }}
         <label> {{ yourSafetyNumberWith }} </label>
-        <div class='qr'></div>
+        <!--<div class='qr'></div>-->
         <div class='key'>
           {{ #chunks }} <span>{{ . }}</span> {{ /chunks }}
         </div>

js/views/key_verification_view.js

@@ -17,8 +17,8 @@
                 this.loadTheirKey(),
                 this.loadOurKey(),
             ]).then(this.generateSecurityNumber.bind(this))
-              .then(this.render.bind(this))
-              .then(this.makeQRCode.bind(this));
+              .then(this.render.bind(this));
+              //.then(this.makeQRCode.bind(this));
         },
         makeQRCode: function() {
             new QRCode(this.$('.qr')[0]).makeCode(