rename 98100.dat from "Brick" to "Cone"

[Franklin W. Cain]

File 98100.dat is labelled "Brick  2 x  2 Round Sloped" within LDraw, but is more accurately labelled (in my opinion) as "Cone 2 x 2 Truncated" at BrickLink.  

The physical part is a cone.  And we already have "Cone" as a top-level descriptor in LDraw.  Can we please get this part file re-labelled accordingly?  

Thanks, 
Franklin