dmails: allow Members to mark dmails as spam.

* Allow Members to mark dmails as spam or not spam (previously Gold only).
* Replace spam and ham endpoints with single update endpoint.

app/views/dmails/ham.js.erb

@@ -1,2 +0,0 @@
-Danbooru.notice("Message marked as not spam");
-$("#spam-links").hide();

app/views/dmails/show.html.erb

@@ -28,14 +28,10 @@
         <%= link_to "Respond", new_dmail_path(:respond_to_id => @dmail) %>
         | <%= link_to "Forward", new_dmail_path(:respond_to_id => @dmail, :forward => true) %>
         | <%= link_to "Permalink", dmail_path(@dmail, :key => @dmail.key), :title => "Use this URL to privately share with a moderator" %>
-        <% if CurrentUser.is_gold? %>
-          <span id="spam-links">
-            <% if @dmail.is_spam? %>
-              | <%= link_to "Not spam", ham_dmail_path(@dmail), remote: :true, method: :post %>
-            <% else %>
-              | <%= link_to "Spam", spam_dmail_path(@dmail), remote: :true, method: :post %>
-            <% end %>
-          </span>
+        <% if @dmail.is_spam? %>
+          | <%= link_to "Not spam", dmail_path(@dmail, format: :js), remote: :true, method: :put, "data-params": "dmail[is_spam]=false" %>
+        <% else %>
+          | <%= link_to "Spam", dmail_path(@dmail, format: :js), remote: :true, method: :put, "data-params": "dmail[is_spam]=true" %>
         <% end %>
         <% if @dmail.reportable_by?(CurrentUser.user) %>
           | <%= link_to "Report", new_moderation_report_path(moderation_report: { model_type: "Dmail", model_id: @dmail.id }), remote: true, title: "Report this dmail to the moderators" %>

app/views/dmails/spam.js.erb

@@ -1,2 +0,0 @@
-Danbooru.notice("Message marked as spam");
-$("#spam-links").hide();

app/views/dmails/update.js.erb

@@ -0,0 +1 @@
+location.reload();