Fix incorrect lib index usage.

exec/lbshell.js

@@ -239,13 +239,13 @@ function Filemenu()
 		 format_opt("|Download file(s)",width,true)
 		,"D",width,undefined,undefined
 		,user.compare_ars("REST D")
-			|| (!file_area.lib_list[bbs.curdir].dir_list[bbs.curdir].can_download)
+			|| (!file_area.lib_list[bbs.curlib].dir_list[bbs.curdir].can_download)
 	);
 	this.add(
 		 format_opt("|Upload file(s)",width,true)
 		,"U",width,undefined,undefined
 		,user.compare_ars("REST U")
-			|| ((!file_area.lib_list[bbs.curdir].dir_list[bbs.curdir].can_upload)
+			|| ((!file_area.lib_list[bbs.curlib].dir_list[bbs.curdir].can_upload)
 			&& file_area.upload_dir==undefined)
 	);
 	this.add(