fix: response for multiple acl dialogs get mixed up

[alanshaw]

This is a fix for the issue reported here: #442 (review)

This PR adds checks to the port connect and tab removed listeners to ensure that the tab that is connecting or being closed is the tab that they are in charge of!

To test:

Promise.all([ipfs.id(), ipfs.files.ls(), ipfs.id(), ipfs.files.ls(), ipfs.files.ls()]).then(console.log).catch(console.log)

Expect 5 dialogs to open*, you should be able to respond to each one individually.

* fix for multiple dialogs for the same permission is coming soon in #442

[lidel]

Tested together with #442 works as expected 👍