Meson: Correct FREECIV_STORAGE_DIR in haiku
Meson based builds should set FREECIV_STORAGE_DIR for haiku same way as autotools build does in boostrap/freeciv.project.
Lets' have #44213 fixed first.
Meson based builds should set FREECIV_STORAGE_DIR for haiku same way as autotools build does in boostrap/freeciv.project.