feat: Invert the left and right output for simple test cases

[AugustoFKL]

Now the right side is the 'expected' one, and the left side is the 'input'. Example:

 #[test_case(2, 2 => 2 + 3)]
 fn result_which_panics(x: u32, y: u32) -> u32 {
     x + y
 }

Previously, the output was:

 Left:  5
 Right: 4

Now, it is:

 Left:  4
 Right: 5

Refs: #125

[frondeus]

LGTM.

@luke-biel

[AugustoFKL]

@luke-biel @frondeus adjusted the nightly snapshot.

[luke-biel]

Those are rather minor bs fails. There's a script ./scrits/test_all.sh that you can use to run all of this locally (just make sure to run rustup update before, to be against latest nightly / stable)

[AugustoFKL]

@frondeus, thank you for the help!

Fixed and validated, the script is running fine.