Simplify code in managers/moderators/admins tables

Originally, the code was shared between the index action and the search
action, but since commit fb6dbdf that's no longer the case. So in the
index action we don't need to check whether a user is a
moderator/manager/admin or not; they all are.

app/views/admin/administrators/index.html.erb

@@ -29,21 +29,13 @@
  <%= administrator.description %>
  </td>
  <td>
- <% if administrator.persisted? %>
- <%= link_to t("admin.actions.edit"),
- edit_admin_administrator_path(administrator),
- class: "button hollow" %>
- <%= link_to t("admin.administrators.administrator.delete"),
- admin_administrator_path(administrator),
- method: :delete,
- class: "button hollow alert" %>
- <% else %>
- <%= link_to t("admin.administrators.administrator.add"),
- { controller: "admin/administrators", action: :create,
- user_id: administrator.user_id },
- method: :post,
- class: "button success expanded" %>
- <% end %>
+ <%= link_to t("admin.actions.edit"),
+ edit_admin_administrator_path(administrator),
+ class: "button hollow" %>
+ <%= link_to t("admin.administrators.administrator.delete"),
+ admin_administrator_path(administrator),
+ method: :delete,
+ class: "button hollow alert" %>
  </td>
  </tr>
  <% end %>

app/views/admin/managers/index.html.erb

@@ -22,20 +22,10 @@
  <%= manager.email %>
  </td>
  <td>
- <% if manager.persisted? %>
- <%= link_to t("admin.managers.manager.delete"),
- admin_manager_path(manager),
- method: :delete,
- class: "button hollow alert expanded"
- %>
- <% else %>
- <%= link_to t("admin.managers.manager.add"),
- { controller: "admin/managers",
- action: :create,
- user_id: manager.user_id },
- method: :post,
- class: "button success expanded" %>
- <% end %>
+ <%= link_to t("admin.managers.manager.delete"),
+ admin_manager_path(manager),
+ method: :delete,
+ class: "button hollow alert expanded" %>
  </td>
  </tr>
  <% end %>

app/views/admin/moderators/index.html.erb

@@ -24,19 +24,10 @@
  <%= moderator.email %>
  </td>
  <td>
- <% if moderator.persisted? %>
- <%= link_to t("admin.moderators.moderator.delete"),
- admin_moderator_path(moderator),
- method: :delete,
- class: "button hollow alert expanded"
- %>
- <% else %>
- <%= link_to t("admin.moderators.moderator.add"),
- { controller: "admin/moderators", action: :create,
- user_id: moderator.user_id },
- method: :post,
- class: "button success expanded" %>
- <% end %>
+ <%= link_to t("admin.moderators.moderator.delete"),
+ admin_moderator_path(moderator),
+ method: :delete,
+ class: "button hollow alert expanded" %>
  </td>
  </tr>
  <% end %>