(winscp*) Fixing URL parsing for download

[gaelcolas]

Description

WinSCP url has changed, appending a /download to the link.
This changes updates de URL and the parsing that goes along with it.

Motivation and Context

The package was failing to update on the community repo.

How Has this Been Tested?

Lightly, as I'm on a traiin :)

Screenshot (if appropriate, usually isn't needed):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Migrated package (a package has been migrated from another repository)

Checklist:

• My code follows the code style of this repository.
• My change requires a change to documentation (this usually means the notes in the description of a package).
• I have updated the documentation accordingly (this usually means the notes in the description of a package).
• I have updated the package description and it is less than 4000 characters.
• All files are up to date with the latest Contributing Guidelines
• The added/modified package passed install/uninstall in the Chocolatey Test Environment(https://github.com/chocolatey-community/chocolatey-test-environment/). Note that we don't support the use of any other environment.
• The changes only affect a single package (not including meta package).

[AppVeyorBot]

✅ Package verification completed without issues. PR is now pending human review

[AppVeyorBot]

✅ Package verification completed without issues. PR is now pending human review

[Waize]

lgtm

[JPRuskin]

Looks good. I've tested it locally, and the packages it produces work as expected.

I'll fix up the commit messages to follow our pattern (if that's okay), and then it should be good to merge!

[AppVeyorBot]

✅ Package verification completed without issues. PR is now pending human review