fix: heat and acid armor work

[LordZanos]

Purpose of change

• fix Acid and Fire Protection on Armors Does Not Work #4275

Describe the solution

Truthiness of a std::optional will always evaluate to true if the optional is not null. Need to check if DT_ACID/DT_HEAT exist in the optional instead.

Describe alternatives you've considered

Feet melting off, idk

Testing

Changed ANBC armor json to have some funny numbers and some normal ones, loaded game:

Spot checked armors that weren't overridden, they looked fine.

Additional context

ow my feat

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[scarf005]

applied following changes to PR description.

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• https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#images