Really release Ezo when playing as them

[moretrim]

The final Ezo Republic event (id 97682) has a straightforward setup, giving four options as to the fate of the republic.

First, the usual two choices between the personal land grab or keeping a puppet around:

• don't agree to their request & release them, leaving them susceptible to be eaten since the island will still have Japanese cores
• agree to their request, keeping them as a puppet with Japanese cores

Then, the two choices between letting the puppet go or letting the puppet go while also playing as them. The option comments & effects are as follows:

• "Set them completely free", releasing & revoking own cores

• "Set them completely free and play as them", also revoking Japanese cores... while not releasing at all!

  https://github.com/arkhometha/Historical-Project-Mod/blob/d812ad33f897866fd38ee58a38a275dc8fe02554/HPM/events/JAPFlavor.txt#L3015-L3024

This change harmonises those last two options:

• really release Ezo in either case
• grant the same amount of diplomatic influence

Note that it was already possible for a player that starts as Japan to switch to an independent Ezo without a save/reload or any trickery. Once Ezo is on the map but before Japan decides its fate, a player can use the GTFO decision to grant the island its independence. The final fate event will still be eligible, letting the player revoke & switch country.

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This change has been (lightly) tested.