fix issue with partial branch match

[jedwards4b]

[ 50 character, one line summary ]
Allow for partial match of branch name.

If the git ls-remote returns a 0 status then also confirm that the ref is the complete branch name by testing "refs/head/{ref}" in the output string.

User interface changes?: No

Fixes: #200

Testing:
test removed:
unit tests: all pass
system tests: most pass - submodules broken due to https://github.blog/2022-10-18-git-security-vulnerabilities-announced/
manual testing: ran tests suggested in #200

[billsacks]

Awesome, thanks for fixing this @jedwards4b and for the helpful comment in your new conditional.

I notice that you added a print statement; I'm guessing you meant to remove that