fixes core#2874 - Search Builder on State/Province with Primary and IN

[MegaphoneJon]

https://lab.civicrm.org/dev/core/-/issues/2874

Overview

Using Search Builder with a field of "State/Province", a location type of "Primary" and an operator of "IN" causes a validation error. Full replication steps, before/after, etc. are on https://lab.civicrm.org/dev/core/-/issues/2874.

Technical Details

This is a fix to PR #8890, which fixed the case where the Search Builder could be passed a string for a state_province value, but didn't consider the case where it's passed an array.

[civibot]

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[eileenmcnaughton]

yay there's a test

[eileenmcnaughton]

test this please

[eileenmcnaughton]

Change reads well & the test is compelling