pySim-trace: Fix missing MANAGE CHANNEL decode

old output:

00 MANAGE CHANNEL 01       9110

new output:

00 MANAGE CHANNEL 01       9110 {'mode': 'open_channel', 'created_channel': 1}

Change-Id: Iac5b24c14d2b68d526ab347462b72548b8731b30
diff --git a/pySim/apdu/ts_102_221.py b/pySim/apdu/ts_102_221.py
index fb2f375..ea45602 100644
--- a/pySim/apdu/ts_102_221.py
+++ b/pySim/apdu/ts_102_221.py
@@ -393,10 +393,12 @@
             manage_channel = rs.get_lchan_by_cla(self.cla)
             manage_channel.add_lchan(created_channel_nr)
             self.col_id = '%02u' % created_channel_nr
+            return {'mode': mode, 'created_channel': created_channel_nr }
         elif mode == 'close_channel':
             closed_channel_nr = self.cmd_dict['p2']
             rs.del_lchan(closed_channel_nr)
             self.col_id = '%02u' % closed_channel_nr
+            return {'mode': mode, 'closed_channel': closed_channel_nr }
         else:
             raise ValueError('Unsupported MANAGE CHANNEL P1=%02X' % self.p1)