Use overmapbuffer.place_special in debug special placement

This brings debug placement more in line with the placement done during
map generation, e.g. it will make connections, record placement into the
data structure tying overmap terrains to the special that placed them,
and so on.

src/overmap_ui.cpp

@@ -1151,10 +1151,9 @@ tripoint display( const tripoint &orig, const draw_data_t &data = draw_data_t()
                             overmap_buffer.ter( curs ) = uistate.place_terrain->id.id();
                             overmap_buffer.set_seen( curs.x, curs.y, curs.z, true );
                         } else {
+                            overmap_buffer.place_special( *uistate.place_special, curs, uistate.omedit_rotation, false, true );
                             for( const auto &s_ter : uistate.place_special->terrains ) {
                                 const tripoint pos = curs + om_direction::rotate( s_ter.p, uistate.omedit_rotation );
-
-                                overmap_buffer.ter( pos ) = s_ter.terrain->get_rotated( uistate.omedit_rotation );
                                 overmap_buffer.set_seen( pos.x, pos.y, pos.z, true );
                             }
                         }