runtime_test.py: correct output check for bash 5.1
Bash 5.1 inserts escape sequences into its output (specifically
disabling bracketed paste mode via \x1b[?2004l). I am not sure
if somehow terminal detection isn't working correctly there,
but in any case the marker is still in the output, but needs to
be checked by 'in' rather than exact equivalence.
Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
