Fixed unstore_unit lua code (issue #5519)

[MrTitainin]

x,y were both binding to whole table instead of their expected values
#5519 should now be solved, although there still might be problem with location_id in teleport code

[soliton-]

Can you fix the call for teleport a couple lines down as well?

[CelticMinstrel]

I see, whoever wrote that (was it me?) must've thought that special_locations returns two values rather than a table. This fix seems fine, if a little ugly. Could also use … I think it's table.unpack?

x, y = table.unpack(wesnoth.special_locations[whatever])

It doesn't really matter, though.

[MrTitainin]

This should address both your concerns.
I also changed priority in [teleport] so that now location_id overrides x and y if present, like in [unstore_unit], but I don't think it will affect anyone, as it's unnecessary to use both in the same tag.

[Vultraz]

Just to confirm, table.unpack worked fine?