Fix path handling on Windows

[drdavella]

No description provided.

[stsci-bot]

Hi there @drdavella 👋 - thanks for the pull request! I'm just a friendly 🤖 that checks for issues related to the changelog. I help make sure that this pull request is milestoned and labeled correctly. This is mainly intended for the maintainers, so if you are not a maintainer you can ignore this, and a maintainer will let you know if any action is required on your part 😃.

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[coveralls]

Coverage decreased (-0.01%) to 95.009% when pulling cddd73e on drdavella:fix-atomic-windows into 1398fdf on spacetelescope:master.

[drdavella]

I'm going to wait to see whether this resolves @Cadair's issue before merging.

[Cadair]

This does appear not to have fixed it https://dev.azure.com/sunpy/sunpy/_build/results?buildId=133&view=logs&jobId=ae117311-855e-5ed1-34c5-0cfd45eca4b5&taskId=1e9bf3b7-4e0f-508c-cc95-5715c738778c&lineStart=41&lineEnd=41&colStart=105&colEnd=132

[Cadair]

Ok this now seems to have fixed it.

[Cadair]

🎉