Python: Fix flags test

In github@25cb52a I accidentally introduced an extra `not` where none existed before. Whoops!

Author: tausbn

python/ql/test/extractor-tests/flags/Flags.ql

@@ -2,7 +2,7 @@ import python
 
 from string k, string v
 where
-  not k.matches("options.%") and
+  k.matches("options.%") and
   not k.matches("options.verbos%") and
   py_flags_versioned(k, v, _)
 select k, v