gstlal_inspiral: Don't hardcode gracedb_min_instruments to 2 in Data

class instantiation

gstlal-inspiral/bin/gstlal_inspiral

@@ -796,7 +796,7 @@ for output_file_number, (svd_bank_url_dict, output_url, ranking_stat_output_url,
 		min_log_L = options.min_log_L,
 		sngls_snr_threshold = options.singles_threshold,
 		gracedb_far_threshold = options.gracedb_far_threshold,
-		gracedb_min_instruments = 2,
+		gracedb_min_instruments = options.min_instruments,
 		gracedb_group = options.gracedb_group,
 		gracedb_search = options.gracedb_search,
 		gracedb_pipeline = options.gracedb_pipeline,