Update: WPSnapshots local copy

[dinhtungdu]

Description of the Change

Due to the new flag introduced in 10up/wpsnapshots#71, when running WPAcceptance locally against a cached environment, the process will be hung with the prompt asking if we want to overwrite local snapshot or not.

This PR fixes that bug by adding the flag to the command called by wpacceptance.

Verification Process

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

[felipeelia]

@dinhtungdu while testing things for ElasticPress I had a similar problem but when we don't have the snapshot already downloaded. It will wait for the user to answer if it should download files and/or database but as nothing is inputted it just times out.

I've tested adding --include_files --include_db to that command and that seemed to do the trick.

Thoughts? Do you think we can include these flags in this PR too? Thanks!