Flag a parameter that is not correct with a @todo.

At the moment, I do not know what the correct parameter should be, but
a hardcode of the first team cannot handle all possibilities.
This is in the implementation of a deprecated Lua function
(wesnoth.highlight_hex), so it might end up removed before being fixed.


git-svn-id: http://svn.gna.org/svn/wesnoth/trunk@56366 75b3775d-3801-0410-9e12-e2e43121521d