adds spending proposal show for valuator and admin

app/controllers/spending_proposals_controller.rb

@@ -2,6 +2,7 @@ class SpendingProposalsController < ApplicationController
   include FeatureFlags
 
   before_action :authenticate_user!, except: [:index]
+  before_action :verify_valuator, only: [:show]
 
   load_and_authorize_resource
 
@@ -31,4 +32,8 @@ class SpendingProposalsController < ApplicationController
       params.require(:spending_proposal).permit(:title, :description, :external_url, :geozone_id, :terms_of_service, :captcha, :captcha_key)
     end
 
+    def verify_valuator
+      raise CanCan::AccessDenied unless current_user.try(:valuator?) || current_user.try(:administrator?)
+    end
+
 end