Black Dragon, KBD, and Metallic Dragon tables

Black Dragon - Table looks accurate. Reduced Visage drop to 1/10000

King Black Dragon - Table was completely messed up. Adjusted weights of "Nothing" to be in line with similar weighted monsters. This fixed most of the table's issues and make KBD worth fighting again. Adjusted weights accordingly based on the sources I could find. Removed coal as there was no mention of it on any source. Visage frequency raised to requested percent.

Iron Dragons - Reduced RDT table to rare weight based on other weights on table. It appears to have used a weight based on other monster RDT drops. checked other drop frequencies and there are no other issues. Reduced Visage frequency as requested.

Steel Dragons - Similar to above. Weights appear to have been managed for specifics regarding Dragon Legs/Skirt drop. RDT was set for high frequency so I fixed it. Adjusted Visage drop as requested.

Mithril Dragons: Fixed RDT drop like the above. Fixed dragon full helm drop rate. Corrected dragon visage drop rate as requested.