Missing party upper boundary check in UpdatePlayer() of LocalizationAndQuests

[cthscr]

Line 736 of LocalizationAndQuests.lua checks for current player to be no less than 0 only. In MM8 (and MM8-based mods) with non-full party someone sometimes can get out of Party.count-1 border.

See https://gitlab.com/cthscr/mmmerge/-/issues/38

[GrayFace]

Are there any other instances of it happening?