Fallback branch is not used when platform autodetection fails

[perlun]

Slightly similar to #290, but not quite: I have my fallback configured like this in the GitLink settings:

Despite this, when GitLink fails to detect the platform (which it typically fails to do for some reason for me), it still falls back to use main. 🤔 This is annoying since most of our repos use master and I would like GitLink to honor this setting. Is this a bug or is this working as intended? (I realize now that the Fallback branch documentation in the UI screenshot here does not imply that it really does what I am asking for...)