Revert to old star/galaxy separator for LATISS

shapeHSM moments were failing on most LATISS sources, which resulted in
sizeExtendedness failing, which meant most sources were being rejected. This
gets us the old behavior while someone looks into why shapeHSM is failing on
LATISS.

config/latiss/calibrateImage.py

@@ -63,6 +63,11 @@
 config.astrometry.matcher.numPointsForShape = 5
 config.astrometry.matcher.numPointsForShapeAttempt = 8
 
+# DM-43593: Use old star/galaxy separator, as SizeExtendedness needs reliable
+# shape measurements, but the shapeHSM moments are not well behaved on LATISS.
+config.star_measurement.plugins.names.remove("base_ClassificationSizeExtendedness")
+config.star_selector["science"].unresolved.name = "base_ClassificationExtendedness_value"
+
 # Apply a magnitude limit and decrease the SNR limit as we're only a 1.2m
 # and frequently take short exposures.
 config.astrometry.referenceSelector.doMagLimit = True