:bug: Fix after GitHub site update

[darkred]

Hey @jerone

I've made a few tweaks to make 'GitHub Commit Compare' work after the recent GitHub site update.

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Two things to note, please:

• the script currently doesn't work when you follow links, i.e. it doesn't work while being e.g. here https://github.com/jerone/UserScripts if you follow the link 526 Commits - it only works if you refresh the page while already being in the Commits page.

• ^{I've taken the liberty of adding my nick as 'Contributor' in this PR (as I did in my other PR, for 'Github News Feed Filter' too). I just hope it's ok with you (sorry I didn't ask you first!). Otherwise (maybe because my tweaks are minor/basic and/or simply because it's your personal work), please feel free to remove // @contributor darkred (and from the other script, too). No problem at all.}

[darkred]

Gladly. I just updated it.

[jerone]

Thanks @darkred 🎬