deploy: fix after_party deployment
deploy: fix after_party deployment

This can be tested locally (without running any SSH commands) using:

```shell
bundle exec mina deploy domain="test.domain" to=production --simulate`
```

This commit turns the after_party command from:

```
cd "/var/www/tps/current" && RAILS_ENV="production" bundle exec rake after_party:run
```

to:

```
RAILS_ENV="production" bundle exec rake after_party:run
```

which is more in line with how other commands are run.
sgmap/tps,sgmap/tps,sgmap/tps