fixed non clearing files

ProjectLifer.py

@@ -104,6 +104,7 @@ class ProjectLiferFrame(Frame):
 
         """Returns a selected directoryname."""
         self.listbox.delete(0, END)
+        self.files.clear()
         self.folder = filedialog.askdirectory(**self.dir_opt)
         for file in os.listdir(self.folder):
             pathfile = os.path.join(self.folder, file)