fix broken shift-clicking in wielder formspec

fixes #34

wielder.lua

@@ -23,9 +23,9 @@ local function set_wielder_formspec(data, meta)
 		"item_image[0.5,0.5;1,1;"..data.name_base.."_off]"..
 		"label[1.5,1;"..minetest.formspec_escape(data.description).."]"..
 		list_background ..
-		"list[current_name;"..minetest.formspec_escape(data.wield_inv_name)..";"..((10-data.wield_inv_width)*0.5)..",1;"..data.wield_inv_width..","..data.wield_inv_height..";]"..
+		"list[context;"..minetest.formspec_escape(data.wield_inv_name)..";"..((10-data.wield_inv_width)*0.5)..",1;"..data.wield_inv_width..","..data.wield_inv_height..";]"..
 		pipeworks.fs_helpers.get_inv((2+data.wield_inv_height)) ..
-		"listring[context;main]" ..
+		"listring[context;"..minetest.formspec_escape(data.wield_inv_name).."]" ..
 		"listring[current_player;main]"
 	)
 	meta:set_string("infotext", data.description)