[lit] Remove unnecessary testcases from lit-quoting.txt that fail on macOS

These were added in 37935405efbebc4bd9f1ffac9152571c6a8469dc,
but they fail on macOS (and on Windows with MSYS based tools, before
relanding D98859). Remove the tests that exercise "not not echo", as
the primary thing to test is the plain echo patterns above.

GitOrigin-RevId: 413d84fb5c6d18efc0c3f478071a11c7c3542fd0
1 file changed