gsudo: Add to PATH instead of shim

[gerardog]

Per ScoopInstaller/Scoop#1896 and gerardog/gsudo#9, gsudo works better without a shim wrapper.

[gerardog]

This is how I tested it:

:: Installing previous version 
❯ scoop install .\gsudo.json
Installing 'gsudo' (0.6.0) [64bit]
Loading gsudo.v0.6.0.zip from cache
Checking hash of gsudo.v0.6.0.zip ... ok.
Extracting gsudo.v0.6.0.zip ... done.
Linking ~\scoop\apps\gsudo\current => ~\scoop\apps\gsudo\0.6.0
Creating shim for 'gsudo'.
Creating shim for 'sudo'.
'gsudo' (0.6.0) was installed successfully!

:: Verify how previous version was installed (using shim)
❯ (Get-Command gsudo).Path
C:\Users\ggrignoli\scoop\shims\gsudo.ps1

❯ gsudo -v
gsudo v0.6
Copyright(c) 2019 Gerardo Grignoli

:: (Updated json with new version)
:: Trigger update

❯ scoop update gsudo
gsudo: 0.6.0 -> 0.7
Updating one outdated app:
Updating 'gsudo' (0.6.0 -> 0.7)
Downloading new version
Loading gsudo.v0.7.zip from cache
Checking hash of gsudo.v0.7.zip ... ok.
Uninstalling 'gsudo' (0.6.0)
Removing shim for 'gsudo'.
Removing shim for 'sudo'.
Unlinking ~\scoop\apps\gsudo\current
Installing 'gsudo' (0.7) [64bit]
Loading gsudo.v0.7.zip from cache
Extracting gsudo.v0.7.zip ... done.
Linking ~\scoop\apps\gsudo\current => ~\scoop\apps\gsudo\0.7
'gsudo' (0.7) was installed successfully!

:: New path not using shims.

❯ (Get-Command gsudo).Path
C:\Users\ggrignoli\scoop\apps\gsudo\current\gsudo.exe

:: New version succesfully deployed
❯ gsudo -v
gsudo v0.7
Copyright(c) 2019-2020 Gerardo Grignoli and GitHub contributors

[gerardog]

Hi @rasa, turns out some people expect the sudo alias to continue working after updating, and this PR was breaking that... I could have created a symlink sudo->gsudo.exe but that would require elevation on creation (for most people) then making the installation interactive (UAC), which I believe is (rightfully) forbidden on scoop.
So, without a perfect solution, what was left was to let sudo be a shim alias, and gsudo.exe in the path (no shum).
That way at least I get gsudo working full without any shim issues, and a limited sudo alias.
Thanks