Reverting memory leak fix

This wasn't a good enough fix, and had other repercussions.

Looking for a way to properly detect EOS, and tear down the correct stream accordingly.

app/scripts/background.js

@@ -86,7 +86,6 @@ function setupControllerConnection (stream) {
   stream.pipe(dnode).pipe(stream)
   dnode.on('remote', (remote) => {
     // push updates to popup
-    controller.ethStore.removeListener('update', controller.sendUpdate.bind(controller))
     controller.ethStore.on('update', controller.sendUpdate.bind(controller))
     controller.listeners.push(remote)
     idStore.on('update', controller.sendUpdate.bind(controller))