SDF: Fix filter on int64 identity properties

[brentrobinson]

Defect Scenario:

• create an SDF file with a feature class with int64 identity property named ID.
• add some features to this class were one of them has ID=5.
• Create an FdoISelect command.
• Create the following filter via:

FdoFilter::Parse(L"ID = 5")

and pass it to the FdoISelect command

• execute the FdoISelect and do a ReadNext() the resulting Feature Reader

ReadNext() returns false, meaning feature 5 was not found.

This defect also happens when the identity property type is int16 or single.