pcap_recorder: use self.filters instead of gen_filter

Change-Id: I53779d521fbeed7c37bcaeb12be2531e4dbc005c
diff --git a/src/osmo_gsm_tester/pcap_recorder.py b/src/osmo_gsm_tester/pcap_recorder.py
index 3b3c307..5453dfd 100644
--- a/src/osmo_gsm_tester/pcap_recorder.py
+++ b/src/osmo_gsm_tester/pcap_recorder.py
@@ -38,7 +38,7 @@
         self.start()
 
     def start(self):
-        self.log('Recording pcap', self.run_dir, self.gen_filter())
+        self.log('Recording pcap', self.run_dir, self.filters)
         dumpfile = os.path.join(os.path.abspath(self.run_dir), self.name() + ".pcap")
         self.process = process.Process(self.name(), self.run_dir,
                                        ('tcpdump', '-n',