tomerfiliba / plumbum / 6723771844

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return flat list from derived object's formulate() (#629)

The StdinDataRedirection command object was returning a list inside a
list, which caused trouble when getting the "str()" of the command.

Example:

    Python 3.10.8 (tags/v3.10.8:aaaf517, Oct 11 2022, 16:50:30) [MSC v.1933 64 bit (AMD64)] on win32
    Type "help", "copyright", "credits" or "license" for more information.
    >>> from plumbum.cmd import head
    >>> cmd = head['-2'] << "one\ntwo\nthree\nfour"
    >>> print(f"{cmd}")
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "C:\Python310\lib\site-packages\plumbum\commands\base.py", line 66, in __str__
        return " ".join(self.formulate())
    TypeError: sequence item 2: expected str instance, list found
    >>>

Co-authored-by: Jason Singer (js731079) <jason.singer@broadcom.com>

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