#MIFOSX-1680 Allow to modifiy frequncy and intervals if calendar is NOT synced with any active entity

   By design, calender update API takes, frequency and intervals as input even when they are not intended to modify/update these attributes, because of this, the new validation was always giving error even if one want to modify other attributes of the calendar such as day of meeting etc.
   
   Now the issue is fixed by adding additional to check, calendar has any active loans associated with it or not.