Corrected Fire Giant DT

What have you done in this MR?

• Corrected Fire Giant DT
  • Added Tertiary DT

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--Sources & Changes--

Fire Giant

• https://runescape.wiki/w/Fire_giant?oldid=2084412
• https://runescape.wiki/w/Fire_giant?oldid=5097914
• https://runescape.wiki/w/Fire_giant
• https://oldschool.runescape.wiki/w/Fire_giant

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Are there any tricky things testers should keep an eye out for?

• Yes, Noted Items.

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• I have tested these changes thoroughly.
• I used the Zaros Tool for any JSON edits where possible and have attached screenshots of any changes.
• I acknowledge that this contribution will be released under the AGPL license.

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