change run_command decode

In the next link can be found detailed information about this
https://www.deanishe.net/alfred-workflow/guide/text-encoding.html#tl-dr

Author: bmunoz89

bluetooth.py

@@ -45,7 +45,7 @@ def __init__(self, wf):
 
     def _run_command(self, command):
         log.debug('Command: "%s"' % ' '.join(command))
-        output = run_command(command).strip().decode('utf-8')
+        output = self._wf.decode(run_command(command)).strip()
         log.debug('Command result: "%s"' % output)
         return output