[lit] Fix c981c533's remaining test fails under windows

For `llvm/utils/lit/tests/shtest-output-printing.py`, the executable
in `%{python}` wasn't properly shell-quoted for windows.  This caused
the 127 exit code mentioned in f254bbf2.  Fix quoting and expect
exit code 1 again.

Fix shell-quoting issue in a few more file names in
`llvm/utils/lit/tests/shtest-shell.py`, missed in f254bbf2.

Test failures seen in
<https://lab.llvm.org/buildbot/#/builders/216/builds/26436>.