Fix sygus quantifier elimination preprocess for multiple functions (#5130)

Fix sygus quantifier elimination preprocess for multiple functions (#5130)

The option --sygus-qe-preproc performs quantifier elimination to coerce certain synthesis conjectures to be single invocation. This technique was broken when multiple synthesis functions were present. This fixes the issue and adds a regression where --sygus-qe-preproc enables a benchmark to be quickly solved.