store normal password in plain text

Unfortunately we must store the surveillance (normal) password in plain
text. The reason is that we need it afterwards when we build the camera
config, to properly set a username:password for the streaming auth.

motioneye/config.py

@@ -669,11 +669,7 @@ def call_hook(u, p):
         call_hook(ui['admin_username'], ui['admin_password'])
 
     if ui.get('normal_password') is not None:
-        if ui['normal_password']:
-            data['@normal_password'] = hashlib.sha1(ui['normal_password']).hexdigest()
-
-        else:
-            data['@normal_password'] = ''
+        data['@normal_password'] = ui['normal_password']
 
         call_hook(ui['normal_username'], ui['normal_password'])