Need to update the generated ./octoshift to octoshift in generate-script command

[bryantson]

When the following command runs:

octoshift generate-script --github-org <Your GitHub Organization> --ado-org <Your ADO organization> --output migrate.sh

This will generate a file called migrate.sh which starts with ./octoshift. However, this should be just octoshift. Otherwise, it will just look at the current path for octoshift CLI tool.

[dylan-smith]

This comes down to what we expect to be most common, the user has octoshift in the PATH (in which case we should do what you suggest), or the user has octoshift in the current dir (in which case we want the ./).