Properly force MMC3 PRG/CHR ROM remap on state load

src/map/mmc3.c

@@ -359,13 +359,11 @@ static int mmc3_state_size(const void* data) {
 static int mmc3_state_read(void* _map, const void* data) {
     mmc3_mapper* map = (mmc3_mapper*)_map;
 
-    uint8_t old_bank_select = map->bank_select;
-
     int size = mmc3_state_size(_map);
     memcpy(map->r, data, size);
 
     uint8_t new_bank_select = map->bank_select;
-    map->bank_select = old_bank_select;
+    map->bank_select = ~new_bank_select;
 
     mmc3_update_rom_mode(map, new_bank_select);
     mmc3_update_vram(map);