Drop unused argument in macro

Signed-off-by: Edwin Török <edwin@etorok.net>

gruvbox.el

@@ -82,7 +82,7 @@ Should contain 2 %s constructs to allow for theme name and directory/prefix")
     (shell-command (format gruvbox-screenshot-command
                            prefix theme))))
 
-(defmacro gruvbox-deftheme (name description palette reduced-specs &rest body)
+(defmacro gruvbox-deftheme (name description palette &rest body)
   `(autothemer-deftheme
     ,name
     ,description