Fix system image's id

Run 'android list sdk --all |grep "System Image"' to get current IDs
in a form like:

  31- ARM EABI v7a System Image, Android API 17, revision 2
  32- Intel x86 Atom System Image, Android API 17, revision 1
  33- MIPS System Image, Android API 17, revision 1
  34- ARM EABI v7a System Image, Android API 16, revision 3
  35- Intel x86 Atom System Image, Android API 16, revision 1
  36- MIPS System Image, Android API 16, revision 4
  37- ARM EABI v7a System Image, Android API 15, revision 2
  38- Intel x86 Atom System Image, Android API 15, revision 1
  39- MIPS System Image, Android API 15, revision 1
  40- ARM EABI v7a System Image, Android API 14, revision 2
  41- Intel x86 Atom System Image, Android API 10, revision 2