noosfero | Fixes some selenium tests failing on "Follow" step (#779)

[Tallys Martins]

New comment for Merge Request 779

https://gitlab.com/noosfero/noosfero/merge_requests/779#note_3453284


Tallys Martins

click_link is good on finding elements but not as good on clicking on it. Sometimes it fails.
```ruby
cucumber -p selenium features/categories_block.feature:42 # Scenario: Show submenu if it exists
cucumber -p selenium features/categories_block.feature:60 # Scenario: Show only one submenu per time
cucumber -p selenium features/edit_article.feature:27 # Scenario: denied access folder for a not logged user
cucumber -p selenium features/edit_article.feature:52 # Scenario: Hide token field when show to members is activated
cucumber -p selenium features/edit_article.feature:74 # Scenario: show exception users field when you choose the private option
cucumber -p selenium features/edit_article.feature:137 # Scenario: display tag list field when creating event
cucumber -p selenium features/edit_article.feature:195 # Scenario: create an article inside a folder
cucumber -p selenium features/edit_article.feature:214 # Scenario: cancel button back to folder after giving up creating

```

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