Always use primary domain for page Direct Access Links building

In some rare cases (but possible) we can have Admin installed on separate sub-domain or location then main website. Current newly developed here functionality would use that sub-domain and NOT URL/domain of the main website.

Example

Front-end - http://www.google.com
Admin - https://admin.google.com

In result link to https://admin.google.com/section.html?index_file=index.php&authkey=bc26a01bff42831998c8

while should have been

http://www.google.com/section.html?index_file=index.php&authkey=bc26a01bff42831998c8