fix: add range filters to oldest items chart

erpnext/stock/dashboard_chart/oldest_items/oldest_items.json

@@ -6,11 +6,11 @@
  "docstatus": 0,
  "doctype": "Dashboard Chart",
  "dynamic_filters_json": "{\"company\":\"frappe.defaults.get_user_default(\\\"Company\\\")\",\"to_date\":\"frappe.datetime.nowdate()\"}",
- "filters_json": "{\"show_warehouse_wise_stock\":0}",
+ "filters_json": "{\"range1\":30,\"range2\":60,\"range3\":90,\"show_warehouse_wise_stock\":0}",
  "idx": 0,
  "is_public": 1,
  "is_standard": 1,
- "modified": "2020-07-22 13:04:36.271198",
+ "modified": "2020-07-29 14:50:26.846482",
  "modified_by": "Administrator",
  "module": "Stock",
  "name": "Oldest Items",