Bug: "Open using IPFS" badge broken on local gateway URLs

[lidel]

(found in nightly-1.27.25-linux-amd64)

Opening a path gateways URL like https://ipfs.io/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR or http://127.0.0.1:48080/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR and clicking on the "Open using IPFS" badge produces an error because duplicated (invalid) path is used in the request:

@spylogsster an example of path gateways is ipfs.io or 127.0.0.1.
(Subdomain gateways like dweb.link and localhost seem to work fine)

[stephendonner]

@spylogsster current behavior on nightly is for

http://127.0.0.1:48081/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR (or http://127.0.0.1:48080/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR) and https://ipfs.io/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR to not show the Open using IPFS badge; should they?

http://127.0.0.1:48081/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR	https://ipfs.io/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR

If so, we should file a separate bug, right?

[spylogsster]

@stephendonner added #16339

[stephendonner]

Verified PASSED using the testplan at brave/brave-core#8971 with build

Brave	1.27.62 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. loaded ipns://brantly.eth
3. clicked on Use a local node
4. loaded https://ipfs.io/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR
5. clicked on the Open using IPFS badge in the URL bar
6. confirmed it opened ipfs://bafybeigdyrzt5sfp7udm7hu76uh7y26nf3efuylqabf3oclgtqy55fbzdi/ which did not have another Open using IPFS badge

example	example