add scar_h_mk20

[GuardianDll]

Summary

None

Purpose of change

Run throught some TODOs in our json, found this one bit that sniper itemgroup for armoury should contain scar h mk20 ssr, not scar h
Decided to add it

Describe the solution

Add a gun, add it to spawn in armoury itemgroup

[github-actions]

Spell checker encountered unrecognized words in the in-game text added in this pull request. See below for details.

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• FN SCAR-H MK 20 SSR

This alert is automatically generated. You can simply disregard if this is inaccurate, or (optionally) you can also add the new words to tools/spell_checker/dictionary.txt so they will not trigger an alert next time.

Hints for adding a new word to the dictionary

• If the word is normally in all lowercase, such as the noun word or the verb does, add it in its lower-case form; if the word is a proper noun, such as the surname George, add it in its initial-caps form; if the word is an acronym or has special letter case, such as the acronym CDDA or the unit mW, add it by preserving the case of all the letters. A word in the dictionary will also match its initial-caps form (if the word is in all lowercase) and all-uppercase form, so a word should be added to the dictionary in its normal letter case even if used in a different letter case in a sentence.
• For a word to be added to the dictionary, it should either be a real, properly-spelled modern American English word, a foreign loan word (including romanized foreign names), or a foreign or made-up word that is used consistently and commonly enough in the game. Intentional misspelling (including eye dialect) of a word should not be added unless it has become a common terminology in the game, because while someone may have a legitimate use for it, another person may spell it that way accidentally.