Set proper default values for redisTableOptions in redisBeginForeignScan

With the changes in the 9.2+ branch I was unable to query the basic scalar table type. 

All the new options on the redisTableOptions struct are not getting default values set causing queries on some table types to fail because the memory is not initialized properly. This prevents me from using the default scalar table type.

This is just a small patch to add the proper defaults to allow those query types to work.