Before 1.9, the last mention of draw_map() and the code below occurs in 1.6 where it is below the delete_the_dead() call.

damage_system::delete_the_dead(&mut self.ecs);

draw_map(&self.ecs, ctx);

let positions = self.ecs.read_storage::<Position>();
let renderables = self.ecs.read_storage::<Renderable>();
let map = self.ecs.fetch::<Map>();

for (pos, render) in (&positions, &renderables).join() {
    let idx = map.xy_idx(pos.x, pos.y);
    if map.visible_tiles[idx] { ctx.set(pos.x, pos.y, render.fg, render.bg, render.glyph) }
}

The setting of backgrounds in ranged_target() gets overwritten by the map drawing/rendering code, and it's not explicitly mentioned in the tutorial that it needs to be moved up to the beginning of tick().. might be helpful add that.