[openstreetmap-website] Hide subscribe and unsubscribe buttons for own changesets (#827)

[Alexander Heinlein]

Currently there is a `subscribe` button for your own changesets although you are automatically subscribed to them. After someone commented on your own changeset this button gets replaced by an `unsubscribe` button.

In my opinion there should be neither a `subscribe` nor an `unsubscribe` button for your own changesets as the changeset author is automatically subscribed and should stay subscribed.

There has been a [related question on help](https://help.openstreetmap.org/questions/38346/changeset-discussion-notification-for-my-own-changeset).

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/827
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