Use min age to participate setting on verification residence form

[decabeza]

References

This a backport of part of AyuntamientoMadrid#1917

Objectives

Use Setting["min_age_to_participate"] on verification residence form. Before, the form was using hardcoded 16 value for birthdate field on verification residence form:

start_year: 1900, end_year: 16.years.ago.year

Now uses the setting:

start_year: 1900, end_year: minimum_required_age.years.ago.year

def minimum_required_age
  (Setting["min_age_to_participate"] || 16).to_i
end