ORCA2_ICE_OBS SETTE test is not synchronised

Context

• Branches impacted: main
• Reference configuration/test case: ORCA2_ICE_OBS

Analysis and fix

The ORCA2_ICE_OBS reference configuration is based on ORCA2_ICE_PISCES, but synchronisation targets cfgs/ORCA2_ICE_OBS which doesn't exist:

configuration ./nemo/cfgs/ORCA2_ICE_OBS_ST/EXP00 not synchronised with ./nemo/cfgs/ORCA2_ICE_OBS/EXPREF

The synchronisation target should be cfgs/ORCA2_ICE_PISCES:

  # syncronisation if target directory/file exist (not done by makenemo)
  clean_config ${CMP_DIR:-${CONFIG_DIR0}}/${SETTE_CONFIG}
- sync_config  ${CONFIG_DIR0}/${config} ${CMP_DIR:-${CONFIG_DIR0}}/${SETTE_CONFIG}
+ sync_config  ${CONFIG_DIR0}/ORCA2_ICE_PISCES ${CMP_DIR:-${CONFIG_DIR0}}/${SETTE_CONFIG}