Invalid URL in Open File in Remote when selecting origin/.. as comparison branch

[letmaik]

• GitLens Version: 9.5.1
• VS Code version: Code 1.32.3 (a3db5be9b5c6ba46bb7555ec5d60178ecc2eaae4, 2019-03-14T23:43:35.476Z)
• OS version: Windows_NT x64 10.0.17763

Steps to Reproduce:

1. Select a branch to compare with and choose one like "origin/foo".
2. Click on Open File with Remote
3. Url is something like https://github.com/user/repo/blob/origin/branch/path/to/file

[github-actions]

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