reference_psd.py: tidy up stream in measure_psd()

gstlal/python/psd.py

@@ -178,7 +178,13 @@ def measure_psd(gw_data_source_info, instrument, rate, psd_fft_length = 8, verbo
 	stream.resample(quality=9) \
 		.capsfilter(f"audio/x-raw, rate={rate:d}") \
 		.queue(max_size_buffers=8) \
-		.whiten(psd_mode=0, zero_pad=0, fft_length=psd_fft_length, average_samples=average_samples, median_samples=7) \
+		.whiten(
+			psd_mode=0,
+			zero_pad=0,
+			fft_length=psd_fft_length,
+			average_samples=average_samples,
+			median_samples=7
+		) \
 		.fakesink()
 
 	#