Simplify fvim-osx-launcher

[gagbo]

Hello,

I had a few issues with HOME not being available in environment on a M1 Mac running Ventura and it got me testing things in the launcher. I found the whole "environment variable extracting" deal a bit complex for what it seems to want to do.

I got fvim working fine after tuning a bit the file to just use exec to directly launch fvim from a login shell; so I'm sharing my modifications in case that's something you'd want to include (I'm not sure it will be good for all installations though).

Cheers,

Gerry

[yatli]

Hi!

Thanks for your contribution! Wondering if there are other OSX users (M1 and Intel) that could try this out?

Thanks, Yatao