Issue #3631620: Fix options widget return type for Drupal 12 (5.x)

Bevan Wishartrequested to merge
issue/dynamic_entity_reference-3631620:3631620-drupal-12-v5 into 5.x

Port of the Drupal 12 massageFormValues() return type fix to 5.x.

Related to #3631620

Edited by Bevan Wishart

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