"Open using IPFS" icon appears twice for separate URLS from the same flow

[stephendonner]

Description

"Open using IPFS" icon appears twice for separate URLS from the same flow

Steps to Reproduce

1. new profile
2. launch Brave
3. load ipns://brantly.eth
4. click on Use a local node
5. load https://bafybeiemxf5abjwjbikoz4mc3a3dla6ual3jsgpdr4cjr3oz3evfyavhwq.ipfs.cf-ipfs.com/wiki/Vincent_van_Gogh.html
6. click on the Open using IPFS icon in the URL bar; you'll land on ipfs://bafybeiemxf5abjwjbikoz4mc3a3dla6ual3jsgpdr4cjr3oz3evfyavhwq/wiki/Vincent_van_Gogh.html
7. now, click on the Open using IPFS icon in the URL bar; you'll land on ipfs://bafybeiemxf5abjwjbikoz4mc3a3dla6ual3jsgpdr4cjr3oz3evfyavhwq//bafybeiemxf5abjwjbikoz4mc3a3dla6ual3jsgpdr4cjr3oz3evfyavhwq/wiki/Vincent_van_Gogh.html

Actual result:

step 5	step 6	step 7

Expected result:

Note the // in the last URI, there: ipfs://bafybeiemxf5abjwjbikoz4mc3a3dla6ual3jsgpdr4cjr3oz3evfyavhwq//bafybeiemxf5abjwjbikoz4mc3a3dla6ual3jsgpdr4cjr3oz3evfyavhwq/wiki/Vincent_van_Gogh.html

This might be a dupe of one of the recent path-gateway URI-resolving issues (such as #16229), but wanted to make sure it was logged as a separate, verifiable-as-fixed case.

Reproduces how often:

100%

Brave version (brave://version info)

Brave	1.27.39 Chromium: 91.0.4472.77 (Official Build) nightly (x86_64)
Revision	1cecd5c8a856bc2a5adda436e7b84d8d21b339b6-refs/branch-heads/4472@{#1246}
OS	macOS Version 11.4 (Build 20F71)

/cc @spylogsster @lidel

[stephendonner]

Verified PASSED using

Brave	1.27.57 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://bafybeiemxf5abjwjbikoz4mc3a3dla6ual3jsgpdr4cjr3oz3evfyavhwq.ipfs.cf-ipfs.com/wiki/Vincent_van_Gogh.html
6. click on the Open using IPFS icon in the URL bar; you'll land on ipfs://bafybeiemxf5abjwjbikoz4mc3a3dla6ual3jsgpdr4cjr3oz3evfyavhwq/wiki/Vincent_van_Gogh.html

step 5	step 6

NOTE: Once #16339 lands, I'll retest in that bug, and ensure that the redundant Open using IPFS badge icon isn't present after step 6 is loaded.