Rework firestaff and fire dart

I think they should do better damage wise for burning for destructive tools as they are,
Fire darts should burn away 10% of a mob's hp while it would perhaps overtime burn down 1-2% of boss hp.
Fire staff would be better at doing fire dart damage with faster burn, but at less percentage health.

I'm only suggesting this to give a use for mostly useless items that we got.