Check multi-tile ID-translated houses after house ID limit change

(Or when reloading NewGRFs)
If an overriding house type which newly fit in the limit changed the
tile layout, existing houses on the map could have the wrong layout

See: #243

src/saveload/extended_ver_sl.cpp

@@ -147,7 +147,7 @@ const SlxiSubChunkInfo _sl_xv_sub_chunk_infos[] = {
 	{ XSLFI_REALISTIC_TRAIN_BRAKING,XSCF_NULL,                2,   2, "realistic_train_braking",   nullptr, nullptr, "VLKA"         },
 	{ XSLFI_INFLATION_FIXED_DATES,  XSCF_IGNORABLE_ALL,       1,   1, "inflation_fixed_dates",     nullptr, nullptr, nullptr        },
 	{ XSLFI_WATER_FLOODING,         XSCF_NULL,                2,   2, "water_flooding",            nullptr, nullptr, nullptr        },
-	{ XSLFI_MORE_HOUSES,            XSCF_NULL,                1,   1, "more_houses",               nullptr, nullptr, nullptr        },
+	{ XSLFI_MORE_HOUSES,            XSCF_NULL,                2,   2, "more_houses",               nullptr, nullptr, nullptr        },
 	{ XSLFI_CUSTOM_TOWN_ZONE,       XSCF_IGNORABLE_UNKNOWN,   1,   1, "custom_town_zone",          nullptr, nullptr, nullptr        },
 	{ XSLFI_NULL, XSCF_NULL, 0, 0, nullptr, nullptr, nullptr, nullptr },// This is the end marker
 };