fix: use shortened commit-sha to check for an autosave match

[m-alisafaee]

Fixes a bug in check for autosaved branch commit-sha where it was checking against the long commit-sha instead of the short one.

[m-alisafaee]

@rokroskar and @lorenzo-cavazzi please test this to see if you it resolves your issue. It worked for me.

[lorenzo-cavazzi]

It's testable in the UI form here: https://lorenzotest.dev.renku.ch
It's working for me, but there is the discussion going on here #187 and this PR is built on top of it, right? If it's not strictly related we can proceed and merge this

[m-alisafaee]

Did you test with this latest commit: 2720d1f?

[lorenzo-cavazzi]

right, let me update the preview and test it again

[lorenzo-cavazzi]

It's working fine for me now! And I absolutely love this feature!

If anyone else what to try the feature from the UI, I updated the preview here: https://lorenzotest.dev.renku.ch/

[m-alisafaee]

Please don't merge this until we agree upon the final solution in #187.

[rokroskar]

@mohammad-sdsc if this meets the requirements we came up with last Friday, could we merge it?

[m-alisafaee]

Done!

[m-alisafaee]

Closes #187