dags/layers/inspiral.py: round gate threshold to 3 decimal digits

gstlal-inspiral/python/dags/layers/inspiral.py

@@ -1245,7 +1245,7 @@ def calc_gate_threshold(config, svd_bin, aggregate="max"):
 			float(y) for x in config.filter.ht_gate_threshold.split("-") for y in x.split(":")
 		]
 		gate_mchirp_ratio = (max_threshold - min_threshold) / (max_mchirp - min_mchirp)
-		return gate_mchirp_ratio * (bank_mchirp - min_mchirp) + min_threshold
+		return round(gate_mchirp_ratio * (bank_mchirp - min_mchirp) + min_threshold, 3)
 	else: # uniform threshold
 		return config.filter.ht_gate_threshold