fix(Grid.js): wrong use in getCellDisplayValue

Author: Rafal Jozwik

src/js/core/factories/Grid.js

@@ -1914,7 +1914,8 @@ angular.module('ui.grid')
       }
     }
 
-    return col.cellDisplayGetterCache(row);
+    var rowWithCol = angular.extend({}, row, {col: col});
+    return col.cellDisplayGetterCache(rowWithCol);
   };