Remove IPFS button on built-in ipfs-webui

[lidel]

Brave 1.26.7 displays "Open using IPFS" badge when /webui is opened via the API port:

This introduces confusing behavior, because when the user clicks on the badge, the same CID is loaded from the Gateway port, which has different Origin than the API port, which in turn asks user to safelist new Origin by setting CORS headers on their go-ipfs node.

I believe the better UX is if the badge is not be displayed when the URL comes from the same origin as API port exposed by go-ipfs.

[lidel]

FYSA in addition to the UX problem described above, this is also impacted by the bug described in #16115

@spylogsster I still think the best course of action here is to now show badge on URLs coming from the API port.

[stephendonner]

Verified FIXED using the testplan from brave/brave-core#8980 with build

Brave	1.27.37 Chromium: 91.0.4472.77 (Official Build) nightly (x86_64)
Revision	1cecd5c8a856bc2a5adda436e7b84d8d21b339b6-refs/branch-heads/4472@{#1246}
OS	macOS Version 11.5 (Build 20G5023d)

Steps:

1. clean profile
2. launched Brave
3. loaded ipns://brantly.eth
4. clicked on Use a local node
5. waited for configuration to finish
6. loaded brave://ipfs-internals/
7. clicked on My Node
8. confirmed on the resulting http://127.0.0.1:45002/ipfs/bafybeianwe4vy7sprht5sm3hshvxjeqhwcmvbzq73u55sdhqngmohkjgs4/#/ page:

• no Open using IPFS badge in the URL bar
• no context-menu option to import the page to IPFS

[vampyren]

How do you uninstall the ipfs?
I accidentally clicked on it next to the badge and suddenly it was running and asking to get added in firewall. I have disabled it from settings but how can it be uninstalled? i don't want a service i dont.