[Patch] setup source page should use command-line option over last selected

[Thrall, Bryan]

Setup.exe currently (based on CVS HEAD) uses the last selected option
from the Source page instead of the command line option (if it is
present). For example, if the user selected "Download without
installing" the last time they ran setup, then that will be selected the
next time setup runs regardless of the command line.

To reproduce:
1) Run 'setup.exe' and on the "Choose Download Source" page, select (for
example) "Download without installing". Click next, then cancel.
2) Run 'setup.exe -L' and go to the "Choose Download Source" page.
"Install from local directory" should be selected, but "Download without
installing" still is.

The attached patch should fix this.

--
Bryan Thrall
FlightSafety International
Bryan.Thrall@flightsafety.com 
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