Update the device name for DummyDevice type

Summary: This diff updates the device display name in the drop down for DummyDevice

Reviewed By: mweststrate

Differential Revision: D26945724

fbshipit-source-id: 6a82c6353f6d8dfe6d3a60e06f0f78d00c39ff59

desktop/app/src/server.tsx

@@ -306,7 +306,7 @@ class Server extends EventEmitter {
     if (transformedMedium === 'WWW') {
       this.store.dispatch({
         type: 'REGISTER_DEVICE',
-        payload: new DummyDevice(device_id, app, os),
+        payload: new DummyDevice(device_id, app + ' Server Exchanged', os),
       });
     }