ZXHN H108N V2.5, module 'ZTE ZXV10 RCE': Fixed false positive issue #305 (#346)

* Router detected as vulnerable while its not #305

* Fixed typo error

* Check status code instead of string

routersploit/modules/exploits/routers/zte/zxv10_rce.py

@@ -137,7 +137,9 @@ class Exploit(exploits.Exploit):
                         "Password": self.password}
 
                 response = http_request("POST", url, self.session, data=data)
-                if "Username" not in response.text and "Password" not in response.text:
+                if "Username" not in response.text \
+                        and "Password" not in response.text \
+                        and response.status_code != 404:
                     print_success("Successful authentication")
                     return True
         except Exception: