Remove unnecessary specs

The test "display administrator id on public views" is not correct. The valuation comments
are not display never on public views. If we reload this admin page we can see that the
description is render instead of administrator_id as we can see at the upper test:

```
scenario "display administrator description on admin views"
```

The deleted test was passed because there is an error at the moment to render the comments.
As we can see in the file ´app/views/comments/create.js.erb:10´ we try render comment
without valuation value:

```
App.Comments.add_comment(parent_id, "<li><%= j(render @comment) %></li>");
```
That it is necessary to render correctly the description or the id.

By other hand the test "public users not see admin description"  is already being checked
 in the 'system/comments_specs'. However, we are going to add a new expectation to
make sure that the admin description does not appear on the public pages.

spec/system/comments/budget_investments_spec.rb

@@ -20,7 +20,7 @@ describe "Commenting Budget::Investments" do
           expect(page).to have_content "I am your Admin!"
         end
 
-        visit admin_budget_budget_investment_path(investment.budget, investment)
+        refresh
 
         within "#comments" do
           expect(page).to have_content "I am your Admin!"
@@ -29,42 +29,6 @@ describe "Commenting Budget::Investments" do
           expect(page).to have_css "img.admin-avatar"
         end
       end
-
-      scenario "display administrator id on public views" do
-        admin = create(:administrator, description: "user description")
-
-        login_as(admin.user)
-        visit admin_budget_budget_investment_path(investment.budget, investment)
-
-        fill_in "Leave your comment", with: "I am your Admin!"
-        check "comment-as-administrator-budget_investment_#{investment.id}"
-        click_button "Publish comment"
-
-        within "#comments" do
-          expect(page).to have_content "I am your Admin!"
-          expect(page).to have_content "Administrator ##{admin.id}"
-          expect(page).to have_css "div.is-admin"
-          expect(page).to have_css "img.admin-avatar"
-        end
-      end
-
-      scenario "public users not see admin description" do
-        manuela = create(:user, username: "Manuela")
-        admin   = create(:administrator, user: manuela)
-        comment = create(:comment,
-                         commentable: investment,
-                         user: manuela,
-                         administrator_id: admin.id)
-
-        visit budget_investment_path(investment.budget, investment)
-
-        within "#comment_#{comment.id}" do
-          expect(page).to have_content comment.body
-          expect(page).to have_content "Administrator ##{admin.id}"
-          expect(page).to have_css "img.admin-avatar"
-          expect(page).to have_css "div.is-admin"
-        end
-      end
     end
   end
 end

spec/system/comments_spec.rb

@@ -570,7 +570,7 @@ describe "Comments" do
 
   describe "Administrators" do
     scenario "can create comment" do
-      admin = create(:administrator)
+      admin = create(:administrator, description: "admin user")
 
       login_as(admin.user)
       visit polymorphic_path(resource)
@@ -584,6 +584,7 @@ describe "Comments" do
       within "#comments" do
         expect(page).to have_content "I am your Admin!"
         expect(page).to have_content "Administrator ##{admin.id}"
+        expect(page).not_to have_content "Administrator admin user"
         expect(page).to have_css "div.is-admin"
         expect(page).to have_css "img.admin-avatar"
       end