Fix broken FileZilla package: change URL

Your FileZilla package is not updating anymore, because the installer (starting from 3.9.0) is now only downloadable via SourceForge. As you probably know, SourceForge is a bit tricky to use with Ketarin, because Ketarin lacks of following HTTP 301/302 redirects which are used there.

I had to “misuse” the `{{DownloadUrlx64}}` substitution variable as 32-bit download URL, otherwise the package would contain a specific mirror URL, which is bad (not all mirrors aren’t always online and some are slow sometimes).

No worries about the adware that was bundled with the FileZilla installer on Windows some time ago. The installer is now adware-free.
> There is no reason to have that much dependence on the ketarin information.

There are reasons. I can think of two:

* It does work in this case, but what if the download URL contains the version in two different lengths? For example, take a look FreeCAD’s download page: http://sourceforge.net/projects/free-cad/files/FreeCAD%20Windows/FreeCAD%200.14/. The folder where the file is hosted is called *FreeCAD 0.14* and the file *FreeCAD-0.14.3700_x64_setup.exe*, so the version in the file name has more segments. Would you fiddle around with regexes in the ps1-file to construct the right version number in this case? It is more straightforward to pass the entire URL as string to `chocopkgup`.
* With your approach, the packages are less maintainer-friendly. If the URL changes, you have to modify the Ketarin job **and** the ps1-file, while with my approach only a modification in the Ketarin job is necessary.