minor cleanup of the image_upload modal partial

Author: Oaphi

app/views/posts/_image_upload.html.erb

@@ -1,19 +1,19 @@
 <div class="modal is-with-backdrop" id="markdown-image-upload">
   <div class="modal--container">
     <div class="modal--header">
-      <button class="button is-close-button modal--header-button" data-modal="#markdown-image-upload">&times;</button>
+      <button class="button is-close-button modal--header-button"
+              data-modal="#markdown-image-upload">&times;</button>
       Image upload
     </div>
     <div class="modal--body">
       <%= form_tag upload_path, multipart: true, class: 'form-inline upload-form js-upload-form' do %>
         <%= hidden_field_tag :authenticity_token, form_authenticity_token %>
         <div class="form-group">
-          <%= label_tag :file, 'Insert an image', class: "form-element" %>
+          <%= label_tag :file, 'Insert an image', class: 'form-element' %>
           <div class="form-caption js-max-size">Max file size <%= SiteSetting['MaxUploadSize'] %>.</div>
-          <%= file_field_tag :file, class: "form-element" %>
+          <%= file_field_tag :file, class: 'form-element' %>
         </div>
       <% end %>
     </div>
   </div>
 </div>
-