whisper function switches microphone input

Summary

When pressing the w key in a whisper group, it switches the microphone to whatever the app thinks is the default one.

support ticket: https://support.mailbox.org/#ticket/zoom/66967

Steps to reproduce the bug

• join with 2 people
• create whisper group
• user A selects another mic that is not selected by default, for me i used the webcam
• press w to speak
• the default mic is used and not the selected one (webcam), you can probably easily hear it, if not tap on the default mic
• release w and it switches back to default

Acceptance Criteria

• pressing w in whisper mode should not switch the microphone input