Fix typo.

client/components/cards/checklists.styl

@@ -159,7 +159,7 @@ textarea.js-add-checklist-item, textarea.js-edit-checklist-item
     padding-top: 2px
     padding-right: 10px;
 
-.js-delete-checklist-item
+.js-delete-checklist-item,
 .js-convert-checklist-item-to-card
   margin: 0 0 0.5em 1.33em
   @extends .delete-text