When in Sidebar, Brave Talk doesn't prompt to allow/block camera and microphone

[stephendonner]

Description

When in Sidebar, Brave Talk doesn't prompt to allow/block camera and microphone

Steps to Reproduce

1. new profile
2. launch Brave
3. load brave://flags
4. type sidebar
5. set Sidebar to Enabled
6. restart Brave
7. open a new-tab page
8. click on the video-camera icon in the Sidebar
9. enter a name
10. click Start free 1:1 call
11. click on either/both the microphone and the video-camera icon(s)

Actual result:

Not prompted to Allow camera and microphone access; instead, get the following errors:

example	example

Expected result:

Should get prompted to Allow access to both camera and microphone

example	example

Reproduces how often:

100%

Brave version (brave://version info)

Brave	1.32.9 Chromium: 94.0.4606.54 (Official Build) nightly (x86_64)
Revision	c8191a1d5cccbf64e8fe7269043f8ace8d74dd05-refs/branch-heads/4606@{#1130}
OS	macOS Version 11.6 (Build 20G165)

/cc @simonhong @petemill @lukemulks