Oversight fix: Plasma->phoron icons

Fixes a... large list of icons whose path was changed but the icon files were not updated in the plasma rename.
Phoron ore
phoron sheets (I KNOW I had done this one with my initial push...)
phoron coin
phoron crate
tank dispensers (phoron tank overlay)
phoron mineral doors
phoron shards
sheets of phoron glass (don't know why I bothered with this one)
Think that's all of it.