fix(balance): Move 3 small shotguns to shotguns skill

[RobbieNeko]

Checklist

Required

• I wrote the PR title in conventional commit format.
• I ran the code formatter.
• I linked any relevant issues using github keyword syntax so it can be closed automatically.
• I have committed my changes to new branch that isn't main so it won't cause conflict when updating main branch later.

Purpose of change

As agreed by others in the Discord, it makes little sense for even sawn-off shotguns such as these to be classified as 'pistols' skill, especially when they're marked down as shotguns for weapon category purposes.

Describe the solution

Changes them over to shotguns skill instead (by just making them not overwrite their copy-from's entry)

Describe alternatives you've considered

• Let it be

Testing

None, other than the eyeball test

Additional context

Just because the terminator can flip-cycle a sawn-off lever action shotgun (with a modified lever mind you) doesn't mean it's now legally classified as a pistol. Shotguns Arnold is an outlier and should be excluded.