* Updated the way in which ScrCmd_givemon and ScriptGiveMon assign a default ability
When an abilityNum is not assigned in a call to givemon performed inside of an overworld script, ScriptGiveMonParameterized will make sure to generate an abilityNum of 0 or 1 in the same way vanilla does it; by defaulting to 0, and then tweaking it based on the least relevant bit of the Pokémon's personality.
ScriptGiveMon will set the default ability of a Pokémon in the same way now too, because even though it was rewritten in #3924, it should ideally produce a Pokémon in a similar way than vanilla does it.
* Removed pointless abilityNum setup in ScriptGiveMonParameterized
eb7ddeb66c