fix(str): ensure we are using string

Signed-off-by: Felipe Zipitria <felipe.zipitria@owasp.org>

Author: fzipi

ftw/ruleset.py

@@ -120,7 +120,7 @@ def __init__(self, raw_request=None,
             if 'Content-Type' in list(headers.keys()):
                 if headers['Content-Type'] == \
                    'application/x-www-form-urlencoded' and stop_magic is False:
-                    if unquote(self.data) == self.data:
+                    if util.ensure_str(unquote(self.data)) == self.data:
                         query_string = parse_qsl(self.data)
                         if len(query_string) != 0:
                             encoded_args = urlencode(query_string)