Remove needless color variables in Stats

Author: yasulab

app/views/stats/show.html.haml

@@ -103,8 +103,6 @@
 
 :javascript
   $(function(){
-    var ac = "lightskyblue"; // Area Color
-    var hc = "deepskyblue";  // Hover Color
     var areas      = JSON.parse('#{@data_by_region.to_json}'.replace( /"/g, '"'));
     var dataByPref = JSON.parse('#{@data_by_prefecture.to_json}'.replace( /"/g, '"'));