text: Title: The start/end_listening sounds should be called with the pulse media.role=phone to enable ducking
  Body: **Describe the bug**
  
  When pulse ducking is enabled, the background audio is only ducked when TTS audio is played. But I think the start and end listening sounds  should also be ducked
  
  **To Reproduce**
  Steps to reproduce the behavior:
  1. Enable ducking
  2. Say "Hey Mycroft.."
  
  Result: The start_listening sound is played, but the existing background music/audio is not ducked.
  
  **Expected behavior**
  
  Play the start/end_listening audio files with the proper pulse audio environment to enable ducking (`media.role=phone`)
  
  **Log files**
  If possible, add log files from `/var/log/mycroft/` to help explain your problem.
  
  You may also include screenshots, however screenshots of log files are often difficult to read and parse. 
  
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  **Environment (please complete the following information):**
   - Device type: RPI 4 
   - OS: Raspbian
   - Mycroft-core version: ab242a2c821553e6ecde0fa656f3be0331aef738
  
  