Exclude melee from wall frags

[Safairette]

Changes

• Melee attacks now no longer create fragments when the fragments from walls are enabled

Reasoning

• Using melee to break buildings/debris carries disproportionate risk with the setting enabled.
• Melee attacks should be the only instances of damage where the tool isn't null, so shouldn't affect anything else.

Testing

Check tests you have performed:

• Compiles without warnings
• Game runs without errors
• Gunshots still make the wall ouchies
• Playtested a colony (specify how long)

[github-actions]

You can download the rebuilt assembly for this PR here: https://combatextended.lp-programming.com/CombatExtended-12067939797.zip

[N7Huntsman]

Failing to prevent the issue; still getting fragments spawning attacking walls with longsword, zeushammer, mace, and bare fists.

[github-actions]

You can download the rebuilt assembly for this PR here: https://combatextended.lp-programming.com/CombatExtended-12095461249.zip