dev/core#4523: Fix membership price sets selection regression on Contribution Pages

[larssandergreen]

Overview

#27079 flipped the logic with the result that you could no longer add a price set, per issue 4523.

Before

Can't add a new membership price set to Contribution Page.

After

Membership price set can be added.

[civibot]

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[civibot]

The issue associated with the Pull Request can be viewed at https://lab.civicrm.org/dev/core/-/issues/4523

[larssandergreen]

This will need a 5.64 backport, since the previous PR had one.

[seamuslee001]

ok this seems to work