Tests: FIXUP Appveyor powershell script.

Author: xoviat

appveyor.yml

@@ -124,7 +124,7 @@ on_finish:
   
   - ps: |
       cd build
-      ls -filter *.py -recurse | foreach {rm $_}
+      ls -filter *.py -recurse | foreach {rm $_.fullname}
       cd ..
   
   - ps: |