Rename agenttypetest .desktop file and revert scripty changes

Scripty has been translating our hand-crafted test .desktop file,
which broke the test. This reverts the changes done by Scripty and
renames the .desktop file to a name which does not exist yet.

Although Scripty should be avoiding .desktop files in test subfolders
automatically, it got possibly confused by the fact that the file
already existed elsewhere and had valid translations.