Issue porting page-blob to blockblob

**Scenario**:
- Using Windows download for 0.6.20
- I have a vhdx uploaded to Azure. By design, it became a page blob.
- I planned to move it to archive, but page blobs can't be archived. I wasn't aware of that...
- I now want to use blobporter to duplicate the blob to a blockblob and remove the pageblob afterwards
(later I want to do that on several TB of VHDX that I've uploaded)

**The command I tried** (with some confidential info removed):

`blobporter
-f "https://saMyAccount.blob.core.windows.net/system20211012/Part1/Backup%202021-10-12%20073026/complexID.vhdx"
-n Part1/Backup%202021-10-12%20073026/complexID.vhdx.removeExtension
-c system20211012
-t blob-blockblob`

**Issue** (with some confidential info removed):

Files to Transfer (blob-blockblob) :
Source: saMyAccount.blob.core.windows.net/system20211012/Part1/Backup 2021-10-12 073026/complexID.vhdx Size:306184192
2021/11/12 16:08:13 -> github.com/Azure/azure-storage-blob-go/azblob.NewResponseError, /home/travis/gopath/pkg/mod/github.com/!azure/azure-storage-blob-go@v0.0.0-20190123011202-457680cc0804/azblob/zz_generated_response_error.go:29
= RESPONSE ERROR (ServiceCode=InvalidBlobType) =
Description=The blob type is invalid for this operation.
RequestId:975a66aa-301e-015d-40d7-d72bfe000000
Time:2021-11-12T15:08:13.1203140Z, Details:
Code: InvalidBlobType
PUT https://saMyAccount.blob.core.windows.net/system20211012/Part1/Backup 2021-10-12 073026/complexID.vhdx?blockid=MD...someid...3D&comp=block&timeout=61
Authorization: REDACTED
Content-Length: [0]
User-Agent: [BlobPorter/0.6.20/amd64/Azure-SDK-For-Go/0.0.0 azblob/2018-03-28 Azure-Storage/0.5 (go1.11; Windows_NT)]
X-Ms-Client-Request-Id: [ad501250-2412-481d-6b73-cdcc3ddcc887]
X-Ms-Copy-Source: [saMyAccount.blob.core.windows.net/system20211012/Part1/Backup 2021-10-12 073026/complexID.vhdx?se=2021-11-12t21%3A08%3A12z&sig=REDACTED&sp=r&sr=b&sv=2018-03-28]
X-Ms-Date: [Fri, 12 Nov 2021 15:08:12 GMT]
X-Ms-Source-Range: [bytes=260046848-268435455]
X-Ms-Version: [2018-03-28]

RESPONSE Status: 409 The blob type is invalid for this operation.
Content-Length: [228]
Content-Type: [application/xml]
Date: [Fri, 12 Nov 2021 15:08:12 GMT]
Server: [Windows-Azure-Blob/1.0 Microsoft-HTTPAPI/2.0]
X-Ms-Error-Code: [InvalidBlobType]
X-Ms-Request-Id: [975a66aa-301e-015d-40d7-d72bfe000000]
X-Ms-Version: [2018-03-28]

**Analysis**:
* It feels as if the page blob is not allowed as a source, while this is the purpose of the "blob-blockblob" transfer type, I guess.
* I don't see another more specific transfer type in the sources of https://github.com/Azure/blobporter/blob/master/transfer/transfer.go
* I tried to specify "-n simpleName" but that doesn't help.

Any suggestions?
Thanks,
Johan