Option resolution for the `StartingLocation` option (the only
`ChoiceIsRandom` subclass) was writing to the `randomized` attribute on
the class instead of on the instance, meaning that
`self.options.starting_location.randomized` would be `True` for all
Blasphemous players in the multiworld if any one of the players set
their `StartingLocation` option to `"random"`.
This patch fixes the issue by writing to the `randomized` attribute on
the new instance instead of on the class.
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