fix#1216:Minimum Date in *Valid Till* DatePicker fixed.

[haran2248]

Issue Fix

Fixes #1216

Screenshots

Description

The valid Till DatePicker Dialogues has been fixed so that the valid till date is chronologically never less than valid from. Few additional warnings have also been rectified along the way

• [x] Apply the AndroidStyle.xml style template to your code in Android Studio.

• [x] Run the unit tests with ./gradlew check to make sure you didn't break anything

• [x] If you have multiple commits please combine them into one commit by squashing them.

[haran2248]

@devansh-299 Please review this

[haran2248]

@devansh-299 please review this

[alphaNewrex]

@devansh-299 can I work on this?