Added IPNS key doesn't dynamically appear in the key-management pane

[stephendonner]

Description

Added IPNS key doesn't dynamically appear in the key-management pane

Steps to Reproduce

1. new profile, launch Brave
2. load ipns://brantly.eth
3. click on Use a local node
4. wait until configuration is finished
5. load brave://settings/ipfs/keys
6. click on Add
7. type a key name and click Import
8. navigate to a key and choose Open
9. wait
10. look at brave://settings/ipfs/keys

Actual result:

The key you just added doesn't appear until you navigate away and back.

Expected result:

The newly-added key should dynamically appear in the Set up your IPNS keys Settings pane

Reproduces how often:

100%

Brave version (brave://version info)

Brave	1.26.43 Chromium: 91.0.4472.77 (Official Build) beta (x86_64)
Revision	1cecd5c8a856bc2a5adda436e7b84d8d21b339b6-refs/branch-heads/4472@{#1246}
OS	macOS Version 11.4 (Build 20F71)

Version/Channel Information:

• Can you reproduce this issue with the current release? no
• Can you reproduce this issue with the beta channel? yes
• Can you reproduce this issue with the nightly channel? n/a

/cc @spylogsster probably just need to attach an event listener?

[stephendonner]

Verified FIXED using the inline testplan with build

Brave	1.27.33 Chromium: 91.0.4472.77 (Official Build) nightly (x86_64)
Revision	1cecd5c8a856bc2a5adda436e7b84d8d21b339b6-refs/branch-heads/4472@{#1246}
OS	macOS Version 11.4 (Build 20F71)

Confirmed that as soon as my mynewkey was imported, it showed up correctly in the Keys available for publishing list.