5e3508f created the issue

Short description of bug: The Web URL feature does not work for files stored on Backblaze B2.

Steps to reproduce:

1. Configure a bookmark to connect to Backblaze B2.

• Enter a URL into the More Options --> Web URL field that is a DNS CNAME to the applicable B2 file server. (e.g., https://files2.heypete.com, since files2.heypete.com is a CNAME to f001.backblazeb2.com)
• Enter "/file" into the Path field.

2. Use the bookmark to connect to B2, create a bucket, and upload a file.
3. Right-click on the file and select "Open URL", "Copy URL", or "Share".
4. Observe that only the https://f001.backblazeb2.com/file/path-to-file URL is displayed. The Web URL entered in step 1 is ignored.

Confirm that behavior is unexpected and B2-specific:

1. Perform step 1 as above, only configure the bookmark to connect to an SFTP server.
2. Perform steps 2 and 3 as above.
3. Note that the Web URL and path specified in step 1 are present and available to open or copy.

Additional details:
I have a B2 bucket with files I wish to share with others. In the file listing in Cyberduck I can right-click the file I wish to share and select "Copy URL" or "Open URL" to get the public-facing URL for that file. If the file is in a private bucket, I can select "Share" and get a URL with an authorization token to allow access to the file. This works as expected, and produces a URL in the form https://f001.backblazeb2.com/file/bucket-name/filename.ext, where f001.backblazeb2.com is the file server my account is assigned, /file/ is a mandatory part of the B2 URL, /bucket-name/ is the name of the B2 bucket I created, and filename.ext is the name and extension of the file.

In order to utilize the Backblaze-Cloudflare partnership that allows for free egress costs (see https://www.cloudflare.com/bandwidth-alliance/backblaze/ and https://help.backblaze.com/hc/en-us/articles/217666928-Using-Backblaze-B2-with-the-Cloudflare-CDN), I have setup a DNS CNAME on my Cloudflare-hosted domain to point at the relevant Backblaze file server. In my case, files2.heypete.com is a CNAME for f001.backblazeb2.com. If I manually take the URL provided by the Copy URL function above and replace https://f001.backblazeb2.com/file/[path-to-file] with https://files2.heypete.com/file/[path-to-file], everything works as expected.

In my Cyberduck bookmark for my B2 bucket, I select "More Options", add "/file" to the Path field and "https://files2.heypete.com" to the Web URL field and save the bookmark. However, when I use that bookmark to connect and use the Copy URL function, the only URL displayed is the https://f001.backblazeb2.com/file/[path-to-file] one.

Thank you!