Fixed redirect with python substitution

[anki-code]

Motivation

Closes #5420

Before

xonsh --no-rc
f = p'/tmp/file.tmp'
echo 'abc' > @(f)
# returns error: xonsh: ['/tmp/file.tmp']: unable to open file

After

xonsh --no-rc
f = p'/tmp/file.tmp'
echo 'abc' > @(f)
cat @(f)
# abc

For community

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[anki-code]

@jnoortheen it's ready to review, please take a look! Thanks!

[anki-code]

@jnoortheen what do you think?

[jnoortheen]

this can better be done at parser level. But I am good with this for now.

[anki-code]

It was regress - #5466 - we need to revert this PR after regress will be fixed.