Add "pce" for backup & restore save state scripts

[myStphane]

Git: 7b8109f

• In file: dump_saves.sh
  => change Line 54, by adding "pce", like: for emu in gb nes gg sms pce; do

• In file: program_saves.sh
  => change Line 56, by adding "pce", like: for emu in gb nes gg sms pce; do

[Konrad Beckmann]

Thanks for noticing!