[APF Support] Fix the Child followup visit scheduling #2931

[nupoorkhandelwal]

Support ticket - https://avni.freshdesk.com/a/tickets/2931

Issue - Currently if there is visit for 6th-Sep scheduled and user completes this visit before the scheduled date, eg.24th August, then it should schedule next followup for 6th-Oct instead of again scheduling for 6th-Sep.

• Fix the above logic in Child Followup visit scheduling logic.

[nupoorkhandelwal]

@Dinesh2019 edit scenario can not be handled currently as there is some issue with the product side code, once it gets fixed we can then test the edit scenario-

avniproject/avni-models#49