Use a float smaller than 1 as a random seed

By using a random seed value smaller than 1, we solve the previous
situation[1] in a simpler way

This test is now obsolete.
It’s hard to write a tests to verify that even with a big seed in
params, we will covert it to a float smaller than 1.

We should refactor these `set_random_seed` methods into a nice model or
controller concern and test it thoroughly

[1]
https://github.com/AyuntamientoMadrid/consul/commit/ba3bf11526fc6ce9c66f
647c414946c61ff945fe

app/controllers/budgets/investments_controller.rb

@@ -111,8 +111,8 @@ module Budgets
 
       def set_random_seed
         if params[:order] == 'random' || params[:order].blank?
-          seed = params[:random_seed] || session[:random_seed] || rand(-100000..100000)
-          params[:random_seed] = Float(seed) / 1000000 rescue 0
+          seed = params[:random_seed] || session[:random_seed] || rand
+          params[:random_seed] = seed
           session[:random_seed] = params[:random_seed]
         else
           params[:random_seed] = nil

spec/features/budgets/investments_spec.rb

@@ -624,15 +624,6 @@ feature 'Budget Investments' do
       end
 
       expect(@first_user_investments_order).to eq(@second_user_investments_order)
-    scenario "Convert seed to a value small enough for the modulus function to return investments in random order", :focus do
-      12.times { |i| create(:budget_investment, heading: heading, id: i) }
-
-      visit budget_investments_path(budget, heading_id: heading.id, random_seed: '12')
-
-      order = investments_order
-      orderd_by_id = Budget::Investment.order(:id).limit(10).pluck(:title)
-
-      expect(order).to_not eq(orderd_by_id)
     end
 
     scenario "Set votes for investments randomized with a seed" do