Fix smart cell indicator when source changes on start #1851
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Currently there's an edge case where the smart cell generates source that differs from Livebook formatting. When a notebook is saved we format the Elixir cell, then once the notebook is open and the smart cell starts, the source is updated to match the smart cell again, so we need to hydrate LV source digest in that case too. Apart from formatting, the source could change when the user opens the notebook and bumps smart cell version (so the generated source may differ).