fix magic number

plugins/workflow_report/app/models/workflow_report_time_entries.rb

 class WorkflowReportTimeEntries < TimeEntry
+  JP_TIME_ZONE = 9
+
   scope :query_time_entry, ->(user_id) {
-    where("#{TimeEntry.table_name}.user_id = ? AND #{TimeEntry.table_name}.spent_on BETWEEN ? AND ?", user_id, DateTime.current.beginning_of_day - 9.hours, DateTime.current.end_of_day - 9.hours).
+    where("#{TimeEntry.table_name}.user_id = ? AND #{TimeEntry.table_name}.spent_on BETWEEN ? AND ?", user_id, DateTime.current.beginning_of_day - JP_TIME_ZONE.hours, DateTime.current.end_of_day - JP_TIME_ZONE.hours).
       joins(:activity, :project).
       references(:issue => [:tracker, :status]).
       includes(:issue => [:tracker, :status, :assigned_to, :priority]).