Core/Spells: some SpellInfo corrections

Corrections to: 
- shaman's stormstrike:
When you have 2 Enha shamans in raid comp, their stormstrikes overwrite each other, so only the last shaman performing it can use the procs. This simple correction fix it.
- ignis grab spell (should always grab his target)
- brundir lightning whirl (should have interrupt flag)
- couple of spells in the freya quarter with wrong targets
how should this work?