bluez: Fix dictionnary key usage

This syntax is wrong, it generates the following error:
File "/usr/lib/python3/dist-packages/apertis_tests_lib/bluez.py", line
  557, in __show_menu
      name = str(i['org.bluez.Device1'].get(['Name'], address))
      TypeError: unhashable type: 'list'

Signed-off-by: Frédéric Dalleau <frederic.dalleau@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D4340

apertis_tests_lib/bluez.py

@@ -554,7 +554,7 @@ class AdapterDeviceTester():
                i['org.bluez.Device1']['Adapter'] == \
                self.__adapter_obj.object_path:
                 address = str(i['org.bluez.Device1']['Address'])
-                name = str(i['org.bluez.Device1'].get(['Name'], address))
+                name = str(i['org.bluez.Device1'].get('Name', address))
 
                 print('%s: %s, %s' % (p, address, name))
         device_path = input("Select one device to pair with: ")