Use recommended git bash args in default detected profile

[Tyriar]

We should use these defaults: https://code.visualstudio.com/docs/editor/integrated-terminal#_windows

Context: #118790 (comment)

[Tyriar]

We decided against doing this because it seems like git-cmd.exe --command=usr/bin/bash.exe -l -i and bin/bash.exe -l are equivalent and both run .bash_profile which was the original reason it was changed in the docs microsoft/vscode-docs#4066. We'll update the docs this release microsoft/vscode-docs#4406

[karlhorky]

Great, thanks for checking into that (and the simplification)!

[karlhorky]

By the way, thanks @meganrogge and yourself @Tyriar, now we have simplified the System Setup guide for our bootcamp students with your simplified start command:

upleveled/system-setup@568f3df