noosfero | fix signup with custom_fields (#783)

[Antonio Terceiro]

New comment for Merge Request 783

https://gitlab.com/noosfero/noosfero/merge_requests/783#note_3542824


Antonio Terceiro

also, since there was no change to the `account_controller` I find it weird that we are adding a test to `account_controller_test`. I fell like this test belongs somewhere else

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