fix direction of comparison

Author: aaronsteers

airbyte_cdk/entrypoint.py

@@ -240,7 +240,7 @@ def discover(
         self, source_spec: ConnectorSpecification, config: TConfig
     ) -> Iterable[AirbyteMessage]:
         self.set_up_secret_filter(config, source_spec.connectionSpecification)
-        if not self.source.check_config_during_discover:
+        if self.source.check_config_during_discover:
             self.validate_connection(source_spec, config)
         catalog = self.source.discover(self.logger, config)