Fix `count(expr("*"))` function

File "/Users/s.singh/personal/spark-oss/python/pyspark/sql/connect/functions.py", line 801, in pyspark.sql.connect.functions.count
Failed example:
    df.select(count(expr("*")), count(df.alphabets)).show()
Expected:
    +--------+----------------+
    |count(1)|count(alphabets)|
    +--------+----------------+
    |       4|               3|
    +--------+----------------+
Got:
    +----------------+----------------+
    |count(alphabets)|count(alphabets)|
    +----------------+----------------+
    |               3|               3|
    +----------------+----------------+
    <BLANKLINE>