[Mobskill] Make pollen use a modifier instead of checking for nm status

[Xaver-DaRed]

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What does this pull request do?

As title sais. TODO: One day, healing spells will get their conversion to the new magic system. And maybe said day we can give a similar treatment to healing mobskills.

Steps to test these changes

Run "Infernal Swarm" BCNM

[UmeboshiXI]

Not too familiar with this BCNM but wiki says Beezlebub can cast Cure. This modifier would also affect the spell power as well. Not sure if that would be the intention if we're just trying to boost Pollen power.