chore: add bpd.options.display.progress_bar = None to a doctest that was missing one (#1155)

Author: tswast

bigframes/ml/compose.py

@@ -68,7 +68,8 @@ class SQLScalarColumnTransformer:
 
         >>> from bigframes.ml.compose import ColumnTransformer, SQLScalarColumnTransformer
         >>> import bigframes.pandas as bpd
-        <BLANKLINE>
+        >>> bpd.options.display.progress_bar = None
+
         >>> df = bpd.DataFrame({'name': ["James", None, "Mary"], 'city': ["New York", "Boston", None]})
         >>> col_trans = ColumnTransformer([
         ...     ("strlen",