Fix variable reference in DocumentAssembler.setCleanupMode
Fix variable reference in DocumentAssembler.setCleanupMode

After the change to `cleanupMode`, a reference in the Python code to `trimAndClearNewLines` was not updated. Fix this reference so code using it will not error out.
JohnSnowLabs/spark-nlp,JohnSnowLabs/spark-nlp,JohnSnowLabs/spark-nlp,JohnSnowLabs/spark-nlp