module template: no need to modify meta.json when building on Windows

[penguinland]

Per discussion in viam-modules/mlmodel-tflite#35, #4969, and on Slack, Windows is smart enough to know that if you try executing foo and the only file present is foo.exe, that's the one to use. So, no need to rewrite meta.json to add the .exe suffix on Windows.

This also makes the code less surprising: if I modify meta.json myself and then build without committing, I don't expect that to discard my changes! 😳

I'm tagging Julie on this PR, but that might be wrong. Julie, feel free to reassign if you don't want to review.

[penguinland]

(I noticed this yesterday when debugging something unrelated with @AGanguly13)

[jckras]

hey @penguinland, I can take a look though I haven't looked at this stuff since my rotation on SDK. Maybe someone on SDK would be a better fit? I tagged @purplenicole730 because I think she looked at this stuff last I remember

[jckras]

based on the context I got from looking at the other PR you tagged this lgtm

[purplenicole730]

I'm also no longer on the SDK team, so I don't know if anything has changed. You should ask Naveed or Ethan for module generator stuff from now on. Based on the description given, it looks good.