Fix all Layout/TrailingWhitespace rubocop issues and remove from rubocop_todo list

.rubocop_todo.yml

@@ -674,12 +674,6 @@ Style/SymbolProc:
     - 'lib/manager_authenticator.rb'
     - 'spec/factories.rb'
 
-# Offense count: 2
-# Cop supports --auto-correct.
-Layout/TrailingWhitespace:
-  Exclude:
-    - 'app/controllers/admin/api/stats_controller.rb'
-
 # Offense count: 31
 # Cop supports --auto-correct.
 Style/UnneededInterpolation:

app/models/geozone.rb

@@ -1,7 +1,7 @@
 class Geozone < ActiveRecord::Base
 
   include Graphqlable
-  
+
   has_many :proposals
   has_many :spending_proposals
   has_many :debates

app/models/organization.rb

@@ -1,7 +1,7 @@
 class Organization < ActiveRecord::Base
 
   include Graphqlable
-  
+
   belongs_to :user, touch: true
 
   validates :name, presence: true

spec/models/abilities/common_spec.rb

@@ -197,7 +197,7 @@ describe "Abilities::Common" do
       it { should_not be_able_to(:vote, investment_in_accepting_budget) }
       it { should be_able_to(:vote, investment_in_selecting_budget) }
       it { should_not be_able_to(:vote, investment_in_balloting_budget) }
-      
+
       it { should_not be_able_to(:destroy, investment_in_accepting_budget) }
       it { should_not be_able_to(:destroy, investment_in_reviewing_budget) }
       it { should_not be_able_to(:destroy, investment_in_selecting_budget) }