Fix complexity of `aeq.select`

[runegan]

Original report by Remco Janssen (Bitbucket: [Remco Janssen](https://bitbucket.org/Remco Janssen), ).

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Warning: 80:14 warning Function has a complexity of 38 complexity

See:
https://bitbucket.org/motiondesign/aequery/src/4fa3668468d17139f7f52924a7b0a4c325842c71/lib/select.js?fileviewer=file-view-default#select.js-80