Bug: "Open using IPFS" not shown on public subdomain gateways

[lidel]

Found in nightly-1.27.25-linux-amd64:

path gateways work as expected, badge is present:

subdomain gateways are missing the badge:

cc @spylogsster – this might be related / fixabletogether with #16115

[stephendonner]

Verified PASSED using

Brave	1.27.56 Chromium: 91.0.4472.101 (Official Build) nightly (x86_64)
Revision	af52a90bf87030dd1523486a1cd3ae25c5d76c9b-refs/branch-heads/4472@{#1462}
OS	macOS Version 11.4 (Build 20F71)

Steps:

1. new profile
2. launch Brave
3. load ipns://brantly.eth
4. click on Use a local node
5. load https://bafybeigdyrzt5sfp7udm7hu76uh7y26nf3efuylqabf3oclgtqy55fbzdi.ipfs.dweb.link/
6. click on the Open using IPFS badge icon in the URL bar
7. confirm it went to ipfs://bafybeigdyrzt5sfp7udm7hu76uh7y26nf3efuylqabf3oclgtqy55fbzdi/

example	example

NOTE: #16339 covers the duplication seen right now on nightly where Open using IPFS keeps appearing, and I'll reverify it separately.