Fix func name (level=>severity)

Author: mopisec

winupdate.py

@@ -56,7 +56,7 @@ def scan(langdata):
     updates = get_available_update(langdata)
     if updates is not None:
         for update in updates:
-            level = report.determine_level('WinUpdate', update)
+            level = report.determine_severity('WinUpdate', update)
             resultdict[update] = (' - ', False, False, False, True, level)
             print('===========================================================')
             cprint(langdata['DETECT_UPDATE_ALERT'], 'red')