submodule checkout broken

[nefarius2001]

Describe the bug
PR #934 breaks git checkout

reproduce
git clone --recurse-submodules https://github.com/jamulussoftware/jamulus >>> FAIL
git clone --recurse-submodules git@github.com:jamulussoftware/jamulus.git >>> FAIL

This is mandatory for github autobuilds (#978), but slipped in Auto-Checks because those do not yet use submodules.

@pljones
What command is your PR aiming for? Can it be improved to fit your needs and have the above still work?

[hoffie]

Thanks for the report. I can confirm. I think the github.com/ part doesn't belong there. Gonna open a PR in a minute.

[ann0see]

Thanks @hoffie!

[pljones]

I shouldn't try to rush things so much...