Fix regression where connections list is empty in common_data

[pavish]

Fixes #3452
Fixes #3455

Technical details
The connections list in common_data was empty, and the list was present within a different key: databases, when opening shared links.

We seem to have missed to make this change in this PR.

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[pavish]

@mathemancer This is a small enough change that I'm going to merge this PR in when the checks pass. Please feel free to take a look post merge.

cc: @seancolsen