Fixes Get-HaloAsset to use Command Separated IDs

[aretokas]

Halo API documentation has comma separated ids listed for all query string parameters where you might want multiple values for the /Asset endpoint.

Added the -CommaSeparatedArrays switch to the cmdlet after testing (quickly) myself.

Without this, attempting to use the -AssetTypes and -AssetGroupTypes (and possibly others) fails to build the parameters:

Exception calling "Add" with "2" argument(s): "Item has already been added. Key in dictionary: 'assettypes'  Key being added: 'assettypes'"