Update ProjectChooser button properly when projects add/removed #1369
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Fixes #1368
Existing code was referencing a model item that was already removed.
Refactor add/remove rows from project_listbox so that their position always matches that in the model. The new code will not cope with multiple items being both removed from and added to the model simultaneously (one signal). This does not happen in practice - projects are either being removed or added at any one time.