Fix write result (plotdir and save_progress template_gen option) issue on windows10

[Halauwet]

What does this PR do?

Format output filename to fix conflict with special character on windows filename

Why was it initiated? Any relevant Issues?

https://github.com/eqcorrscan/EQcorrscan/issues/344

PR Checklist

• [ ] develop base branch selected?
• [ ] This PR is not directly related to an existing issue (which has no PR yet).
• [ ] All tests still pass.
• [ ] Any new features or fixed regressions are be covered via new tests.
• [ ] Any new or changed features have are fully documented.
• [ ] Significant changes have been added to CHANGES.md.
• [ ] First time contributors have added your name to CONTRIBUTORS.md.

[calum-chamberlain]

@Halauwet Can you please rebase this on the develop branch? In your fork, please switch to the develop branch and make the changes there and submit a new PR from your fork to the develop branch of this repository?

[Halauwet]

@Halauwet Can you please rebase this on the develop branch? In your fork, please switch to the develop branch and make the changes there and submit a new PR from your fork to the develop branch of this repository?

Done, @calum-chamberlain