use codename for unknown devices

static/releases.html

@@ -28,7 +28,7 @@
             <div id="stable"></div>
             <h2>Beta channel</h2>
             <div id="beta"></div>
-            <script src="/releases.js?0"></script>
+            <script src="/releases.js?1"></script>
         </div>
     </body>
 </html>

static/releases.js

@@ -23,7 +23,7 @@ function deviceModel(device) {
     if (device === "walleye") {
         return "Pixel 2";
     }
-    return "Unknown";
+    return device;
 }
 
 for (const channel of channels) {