Fix yellow in zenburn.Xdefaults to be visible

Ie. yellow should not be actually a very dark grey.

dotfiles/config/Xlib/colorscheme/zenburn.Xdefaults

@@ -17,7 +17,7 @@ URxvt.color7:           #DCDCCC
 URxvt.color8:           #808080
 URxvt.color9:           #cc9393
 URxvt.color10:          #7f9f7f
-URxvt.color11:          #222222
+URxvt.color11:          #ecd393
 URxvt.color12:          #94bff3
 URxvt.color13:          #ec93d3
 URxvt.color14:          #93e0e3