Fix the issue of five extra blank lines on Windows

[Ky9oss]

This PR resolves an issue on Windows where send_file and send_mark tasks in ipython and Python 3.13/3.14 REPL result in an additional five blank lines at the end. Example:

>>> print('hello world')
hello world
>>> 
>>> 
>>> 
>>> 
>>> 

The issue arises because core.send adds an extra \r for string-type data and two \r for other data types on Windows. In common.bracket_paste_python, these are treated as two separate arrays, each appended with an empty data item. During a single send_file or send_mark, the following three groups of data are sent:

{ "print('hello world')", "" }
{ "\r", "" }
{ "\r", "" }

On Windows, each empty data item causes an extra line break. This results in five blank lines instead of the expected two. This PR fixes the issue.