[FIX] account_ebics - Allow removing pain.002 EBICS files

The pain.002 unlink hook raised NotImplementedError, so no EBICS file
with that processing method could be deleted. Make it a no-op
placeholder like the other formats.

account_ebics/models/ebics_file.py

@@ -652,7 +652,6 @@ class EbicsFile(models.Model):
         Placeholder for pain.002 specific actions before removing the
         EBICS data file.
         """
-        raise NotImplementedError
 
     def _process_undefined_format(self):
         raise UserError(