Revert "Save changes before finalizing ECalBackendStore."
Revert "Save changes before finalizing ECalBackendStore."

This reverts commit 0496d0691cfdfb1e5ad4a03da1f791d533ad1bd5.

Thought of a better way to solve the final save problem that doesn't
involve adding new API or modifying backends.

GNOME/evolution-ews,GNOME/evolution-ews