Collection radio buttons and collection check boxes through FormBuilder render
the provided block.

In the case of having a form_for method being called, the block for each
collection would not be passed and thus the result expected was always the same.
This patch passes the block to the original method like it would be assumed.
Merge pull request #8916 from josemota/collection-with-block

Collection radio buttons and collection check boxes through FormBuilder render the provided block.

Closes #8897