SCUBA2: unlink QL variants of FTS-2 scan recipes

The quick look doesn't need to reduce FTS-2 scans and ZPD
calibrations.  These operations probably take too long.
SCUBA2: link FTS-2 QL variants to REDUCE_SCAN_QL

This should allow the quick look to monitor the noise
performance, as for plain SCUBA-2 scans.