Bluetooth speaker connected by one user doesn't allow access with another user

## What Happened

User A connects bluetooth speaker. User B then switches to their account. Speaker is still connected, but not accessible. User B disconnects bluetooth through any means (turning off bluetooth, turning off or re-pairing speaker). Bluetooth speaker audio is still inaccessible until either a. User A logs back in and disconnects from Bluetooth speaker or b. User A logs back in and changes audio output back to another source.

At this point, the speaker becomes available in Switchboard Audio as an output sink, but still will not play audio in User B's account.

## Expected Behavior

When User B logs in, User B should either a. have access to already-connected audio devices or b. able to disconnect and reconnect to enable access via their account, without having to completely log out and log back in or restart the computer.

## Steps to Reproduce

See above. This is a problem with multi-user systems.

1. User A connects to bluetooth audio device.
2. User B tries to access same bluetooth audio device and cannot.
3. User B tries to disconnect and reconnect, and still cannot access bluetooth audio for that device.
4. This hasn't been tested with different devices for User A and User B. Testing for this would help determine the level of the issue.

### Logs

dmesg is spammed with:

> snd_hda_intel 0000:06:00.1: spurious response 0x0:0x0, last cmd=0x620000
> snd_hda_intel 0000:06:00.1: spurious response 0x0:0x0, last cmd=0x620000
> Bluetooth: hci0: urb 000000004e1c6efe submission failed (90)
> Bluetooth: hci0: sending frame failed (-90)
> Bluetooth: hci0: SCO packet for unknown connection handle 0

## Platform Information
Latest release: elementary OS 5.1.7 Hera
AMD Ryzen 7 PRO 4750G with Radeon Graphics, Gigabyte Aorus Pro B550i motherboard with Intel AX200 wifi/bluetooth