localStorage and sessionStorage share Storage.prototype, so there is
only one setItem to wrap and one to restore. The previous code kept a
never-assigned originalSessionSetItem field and a dead second if branch
that restored from a field already nulled out a few lines above.
Collapse the two fields into a single originalSetItem and drop the dead
branch. No behavioural change.
Signed-off-by: Émile Ré <emile@getprobo.com>
04fdaed772