sp_DatabaseRestore - support @FileExtensionDiff parameter

[spurdata]

Is your feature request related to a problem? Please describe.
sp_DatabaseRestore will only restore DIFF backups if they use the *.bak extension. If you use the @FileExtensionDiff = 'dif' or something similar during Ola's backups, the diffs are ignored during restore.

Describe the solution you'd like
I would like sp_DatabaseRestore to support the same @FileExtensionDiff parameter that DatabaseBackup does, so that I do not have to tweak each new version of sp_DatabaseRestore :)

Describe alternatives you've considered
You could also modify the filter "WHERE BackupFile LIKE N'%.bak'" to just include ".dif" if we think that is the most common alternative to ".bak", but this seems like a poor solution.

Are you ready to build the code for the feature?
Yes I have a modified version of 8.13 working.

[BrentOzar]

Sure, we'd welcome a pull request for that!

[spurdata]

Alrighty, working through that...

[BrentOzar]

Thanks for the pull request! Looks good, works on my machine. Merging into the dev branch, will be in the next release with credit to you in the release notes.