Tweak - SMS OTP message customization

[MILAN88888]

All Submissions:

• Have you followed the User Registration Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Previously, The message content of SMS OTP is not editable. Now we have provided that in form settings.

Dependency PR:

https://github.com/wpeverest/user-registration-pro/pull/585

How to test the changes in this Pull Request:

1. Setup sms integration https://docs.wpuserregistration.com/docs/sms-integration/
2. Goto edit form > form settings > SMS OTP message content > edit and save
3. Verify the message.

Types of changes:

• Bug fix (non-breaking change which fixes an issue)
• Enhancement (modification of the currently available functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you successfully ran tests with your changes locally?
• Have you updated the documentation accordingly?

Changelog entry

Tweak - Sms otp message customization.