Remove ActiveRecord::Transactions#rollback_active_record_state!

`rollback_active_record_state!` was removed from `save!` but not `save`
in da840d13da865331297d5287391231b1ed39721b. I believe that leaving it
in `save` was a mistake, since that commit was intended to move the
rollback logic from the `save`/`save!` call to the transaction stack.

As of 67d8bb963d5d51fc644d6b1ca20164efb4cee6d7 the record's original
state is lazily restored the first time it's accessed after the
transaction, instead of when a rollback occurs. This means that the call
to `restore_transaction_record_state` here has no effect: the record's
transaction level is incremented twice (in rollback_active_record_state!
and `with_transaction_returning_status`), isn't decremented again until
the the `ensure` block runs, and won't hit zero until the next time
`sync_with_transaction_state` is called.

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