Fix: Don't give option to unload the loaded ruleset when saving as Baseline model [5817]
Bug Number: 5817
Release notes (y/n): Yes
For Release Nums: 7.2

Gnats 5817: Save as Baseline gives bogus warning about unloading ruleset.

When the workspace GUI receives a notification that the SimWS's "is baseline 
model" flag has changed, it had been closing all dialogs WITH an indication 
to also DELETE those open dialogs.  Note that the effect of "alsoDelete" -- 
in calls to Workspace::closeAllDialogs (bool alsoDelete) -- is limited to RPL 
dialogs.  It was the latter (RPL dialog deletion) which was querying the user 
about UNLOADING the loaded ruleset -- which definitely should not be a result 
of saving the model as a baseline model (or saving a baseline model as a 
non-baseline model).

This change does retain the side effect of closing all dialogs (just to be 
conservative -- there may be a non-fundamental technical reason why that's 
needed, e.g. if those dialogs would not otherwise appropriately update 
according to the "is baseline model" flag change).  But we are no longer also 
forcing a deletion of RPL dialogs.

See the change the Workspace::callbackHandler() method, in the 
"WS_BASELINE_CHANGED" callback case; its call to Workspace::
closeAllDialogs (bool alsoDelete).

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