Useless registry entry should be deleted

Hi,

If the "Start Bridge at login" option is unchecked, Bridge maintains a useless empty entry in the Windows registry

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run | AdobeBridge

This is wrong. The AdobeBridge value should be deleted, not emptied. This may fool some startup management utilities. Not a big deal but this very old bug should be fixed now.