noosfero | Fix subdir link when creating a new task. (#516)

[Gabriela]

New comment for Merge Request 516

https://gitlab.com/noosfero/noosfero/merge_requests/516#note_1224107


Gabriela

@diguliu I think we found a way:

```ruby
Noosfero.stubs(:root).returns('/subdir')
```

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