REF: simplify reindexing in _align_series()
Follow-up to #46058

> Could you adress [#46058 (comment)](https://github.com/pandas-dev/pandas/pull/46058#discussion_r821210037) too?

That's what I intended to address, actually. No more `self.values` in the new version.  Sorry, should have looked closer. Forget what I‘ve said thanks @johannes-mueller 