Submitting existing job doesn't pre-fill with posted values

[dsaric-dev]

WP Job Manager will use posted values to pre-fill form data in case when listing is new, but it doesn't seem to do that when editing existing listing, and instead pre-fills the form data with existing listing data (if a server side validation error occurs).

Steps to Reproduce

1. Visit job dashboard, edit existing listing
2. Make a change to any field
3. Bypass client side validation (html5 required attribute) for some required field and make that field empty to trigger server side validation error
4. Any changes made in 2. are lost

WordPress / WP Job Manager Version

Reproducible on https://demo.wpjobmanager.com

Screenshot / Video

https://www.dropbox.com/s/ccvdsilgaqvjzvp/2019-07-01_04-57-22.mp4?dl=0