Remove question option uniqueness validation

Having translations makes this validation too complex and not worth the
effort, since now we can't just scope in a single column but we need to
scope in the translations locale and the question ID.

app/models/legislation/question_option.rb

@@ -9,5 +9,5 @@ class Legislation::QuestionOption < ActiveRecord::Base
   has_many :answers, class_name: 'Legislation::Answer', foreign_key: 'legislation_question_id', dependent: :destroy, inverse_of: :question
 
   validates :question, presence: true
-  validates_translation :value, presence: true # TODO: add uniqueness again
+  validates_translation :value, presence: true
 end

spec/models/legislation/question_option_spec.rb

@@ -6,13 +6,4 @@ RSpec.describe Legislation::QuestionOption, type: :model do
   it "is valid" do
     expect(legislation_question_option).to be_valid
   end
-
-  it "is unique per question" do
-    question = create(:legislation_question)
-    valid_question_option = create(:legislation_question_option, question: question, value: "uno")
-
-    invalid_question_option = build(:legislation_question_option, question: question, value: "uno")
-
-    expect(invalid_question_option).not_to be_valid
-  end
 end