Custom Purge Url textarea option

[mist-webit]

Custom Purge Url option does not show newlines when using multiple urls. Therefore when one saves options but does not make changes to this option, option is saved as one url:

/url1/
/url2/

is shown:
/url1//url2/

I believe line 522 on /admin/partial/nginx-helper-general-options.php should use esc_textarea instead of esc_url