stat_density2d: remove weight from list of aesthetics in help

Author: wch

R/geom-path-density2d.r

@@ -25,5 +25,5 @@ GeomDensity2d <- proto(GeomPath, {
   objname <- "density2d"
 
   default_stat <- function(.) StatDensity2d
-  default_aes <- function(.) aes(weight=1, colour="#3366FF", size = 0.5, linetype = 1, alpha = NA)  
+  default_aes <- function(.) aes(colour="#3366FF", size = 0.5, linetype = 1, alpha = NA)
 })