build: add back libddwaf in the layer

Author: florentinl

Dockerfile

@@ -21,7 +21,6 @@ RUN pip install --no-cache-dir . -t ./python/lib/$runtime/site-packages
 RUN rm -rf ./python/lib/$runtime/site-packages/botocore*
 RUN rm -rf ./python/lib/$runtime/site-packages/setuptools
 RUN rm -rf ./python/lib/$runtime/site-packages/jsonschema/tests
-RUN find . -name 'libddwaf.so' -delete
 RUN rm -f ./python/lib/$runtime/site-packages/ddtrace/appsec/_iast/_taint_tracking/*.so
 RUN rm -f ./python/lib/$runtime/site-packages/ddtrace/appsec/_iast/_stacktrace*.so
 RUN rm -f ./python/lib/$runtime/site-packages/ddtrace/internal/datadog/profiling/libdd_wrapper*.so