Remove unused variables (mmistakes#1996)

Author: VincentTam

_includes/comments-providers/staticman.html

@@ -1,8 +1,6 @@
 {% if site.repository and site.staticman.branch %}
   <script>
     (function ($) {
-    var $comments = $('.js-comments');
-
     $('#new_comment').submit(function () {
       var form = this;
 
@@ -39,4 +37,4 @@
     }
   })(jQuery);
   </script>
-{% endif %}
+{% endif %}

_includes/comments-providers/staticman_v2.html

@@ -1,8 +1,6 @@
 {% if site.repository and site.staticman.branch %}
   <script>
     (function ($) {
-    var $comments = $('.js-comments');
-
     $('#new_comment').submit(function () {
       var form = this;
 
@@ -39,4 +37,4 @@
     }
   })(jQuery);
   </script>
-{% endif %}
+{% endif %}