Remove impossible conditional in RealSave_Town

Saving always uses the current savegame version SAVEGAME_VERSION,
which is non-decreasing and already greater than 166.

(cherry picked from commit 6b79497d380b3ae865ddf4d3efb71c319a2bb579)

src/saveload/town_sl.cpp

@@ -267,8 +267,6 @@ static void RealSave_Town(Town *t)
 		}
 	}
 
-	if (IsSavegameVersionBefore(166)) return;
-
 	SlObject(&t->cargo_accepted, GetTileMatrixDesc());
 	if (t->cargo_accepted.area.w != 0) {
 		uint arr_len = t->cargo_accepted.area.w / AcceptanceMatrix::GRID * t->cargo_accepted.area.h / AcceptanceMatrix::GRID;