horizon.py: fix duplicated class name.

gstlal-inspiral/python/plots/horizon.py

@@ -25,7 +25,7 @@ from matplotlib import pyplot
 
 from gstlal import far
 from gstlal.plots import util as plotutil
-from gstlal.psd import read_psd, HorizonDistance
+from gstlal.psd import read_psd, HorizonDistance as calc_horizon_distance
 
 
 class UnknownExtensionError(Exception):
@@ -105,7 +105,7 @@ class HorizonDistance:
 			psds = read_psd(f, verbose = verbose)
 			for ifo, psd in psds.items():
 				if psd is not None:
-					horizon_history_dict[ifo].update({int(psd.epoch): HorizonDistance(10., 2048., psd.deltaF, 1.4, 1.4)(psd, 8.)[0]})
+					horizon_history_dict[ifo].update({int(psd.epoch): calc_horizon_distance(10., 2048., psd.deltaF, 1.4, 1.4)(psd, 8.)[0]})
 		return cls(horizon_history_dict, verbose=verbose)
 
 	@staticmethod