std.compress.flate.Decompress: delete bad unit tests

if I remove the last input byte from "don't read past deflate stream's
end" (on master branch), the test fails with error.EndOfStream. what,
then, is it supposed to be testing?
42b10f08ccAndrew Kelley committed on 8/1/2025, 5:10:11 AMparent5f79046
1 file changedLine totals unavailable