test: Fix malformed multi-line test case

This case was passing part of the css text as boolean
'swapLtrRtlInUrl' to flip(). And another piece of css text as
extra third argument to assert.equal. Worked since both arguments
were superfluous and the first part ('/* @noflip */') roundtrips
properly.

This was originally imported from the python code where the
test cases were arrays (most only had one line, but this one had
two).