Add merit bonuses for Protectra V & Shellra V

Added the merit bonuses for Protectra V & Shellra V, as they were not factored into the current scripts.

Protectra V: Each additional merit point beyond the 1st is supposed to boost the power by 5
Shellra V: Each additional merit point beyond the 1st is supposed to boost the power by 1

With this change & the Martyr #103 & Devotion #101 changes, White Mage Group 2 Merits should be fully functional :-)

Let me know if there is anything I need to adjust

-SLK