Do not pass raw RFC-8484 urls when make DOH override in IPFS

[cypt4]

Kubo(go-ipfs) only supports POST DOH requests.
https://github.com/libp2p/go-doh-resolver/blob/master/request.go#L28
If DOH is overriden by url with {?dns} template then DNS resolution errors happens.
So we should clear the provided DOH url from {?dns} templates or not override DOH if such url is selected.

[ShivanKaul]

@cypt4 we discussed this in privacy confab today but we didn't understand what the issue was
Taking a look at the PR, seems like it's simply replacing the {?dns} substring from the DoH server URL if it exists. It's confusing that the PR fixes two separate issues under one title.

[cypt4]

@cypt4 we discussed this in privacy confab today but we didn't understand what the issue was Taking a look at the PR, seems like it's simply replacing the {?dns} substring from the DoH server URL if it exists. It's confusing that the PR fixes two separate issues under one title.

Yep, sorry for merging 2 issues in the one pr, this is made to push this changes to 1.43 faster.
I've fixed PR's description.

[kjozwiak]

The above will require 1.43.81 or higher for 1.43.x verification.

[stephendonner]

Verified PASSED using

Brave	1.43.81 Chromium: 104.0.5112.102 (Official Build) (x86_64)
Revision	8e5396254975ef939f2ef7d0bd334e48a052b536-refs/branch-heads/5112@{#1478}
OS	macOS Version 11.6.8 (Build 20G730)

Followed the steps to reproduce from brave/brave-core#14631 (comment).

Confirmed I was able to load ipns://ipfs.io

example	example	example	example