[lua] Fix ranged PDIF edgecase

[UmeboshiXI]

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What does this pull request do?

Fixes an edge case where a target's DEF was not clamped and could be reduced/floored to 0 by attacks that ignore defense. Once it hit a certain threshold, it would cause the attack to deal 0 damage.

calculateMeleePDIF() already had this fix applied.

Steps to test these changes

Open archery skill "Split Shot" script. Change ignoredDefense to 1.0. See that the attack does not deal 0 damage to a target.