Update infer-web.py (#864)

fix ModuleNotFoundError: No module named 'config'
fix NameError: name 'sys' is not defined

Author: Mix007

infer-web.py

@@ -1,5 +1,8 @@
 import os
 import shutil
+import sys
+now_dir = os.getcwd()
+sys.path.append(now_dir)
 import traceback, pdb
 import warnings