Python: Flip test expectation

This test should now validate that we no longer have dataset check
errors even when there are unencodable characters.

Author: tausbn

python/extractor/cli-integration-test/string-encoding/test.sh

@@ -13,7 +13,6 @@ rm -rf db
 
 $CODEQL database create db --language python --source-root repo_dir/
 
-# Note the negation in front -- it witnesses the fact that currently the dataset check FAILS.
-! $CODEQL dataset check db/db-python
+$CODEQL dataset check db/db-python
 
 echo "Test successfully completed."