Description of problem:
Run Once dialog (in both Webadmin and User Portal) ignores custom (manually typed-in) values of the Domain (in the Initial Run subtab).

Steps to Reproduce:
 - create a Windows machine
 - invoke run once dlg on it
 - in boot options, select [sysprep]
 - in initial run, select some domain using "Domain" drop-down menu to fill the textbox
 - then click on the textbox and change the value to something different

Actual results:
The domain record in the sysprep file on the floppy contains the domain that was selected using drop-down menu.

Expected results:
The domain record in the file should contain the value user has manually typed in.