Improve parsing for spells like Spirit Guardians with multiple damage types

[VTTAssets]

Reported by: David on Source: VTTAssets Discord

I mainly have issues with spells that specify optional things and both options are added into the spell roll... so it says and does X amount of Radiant OR nectrotic damage... and the imported spell will roll 2X dice

[MrPrimate]

Destructive Wave and Spirit Guardians are two test spells.