Extract controllers to support investments

Since we're going to add an action to remove supports, having a separate
controller makes things easier.

Note there was a strange piece of code which assumed users were not
verified if they couldn't vote investments. Now the code is also
strange, since it assumes users are not verified if they can't create
votes. We might need to revisit these conditions if our logic changes in
the future.

app/controllers/management/budgets/investments/votes_controller.rb

@@ -0,0 +1,17 @@
+class Management::Budgets::Investments::VotesController < Management::BaseController
+  load_resource :budget, find_by: :slug_or_id
+  load_resource :investment, through: :budget, class: "Budget::Investment"
+
+  def create
+    @investment.register_selection(managed_user)
+
+    respond_to do |format|
+      format.html do
+        redirect_to management_budget_investments_path(heading_id: @investment.heading.id),
+          notice: t("flash.actions.create.support")
+      end
+
+      format.js
+    end
+  end
+end

app/controllers/management/budgets/investments_controller.rb

@@ -38,19 +38,6 @@ class Management::Budgets::InvestmentsController < Management::BaseController
   def show
   end
 
-  def vote
-    @investment.register_selection(managed_user)
-
-    respond_to do |format|
-      format.html do
-        redirect_to management_budget_investments_path(heading_id: @investment.heading.id),
-          notice: t("flash.actions.create.support")
-      end
-
-      format.js
-    end
-  end
-
   def print
     @investments = @investments.apply_filters_and_search(@budget, params).order(cached_votes_up: :desc).for_render.limit(15)
   end