[DQT] Fix visit list filtering in candidate matching

[HenriRabalais]

Description

Fixes a bug where DQT filters did not apply visit list criteria when matching candidates. The getCandidateMatches() method was not passing the $visitlist parameter to buildQueryFromCriteria(), and the visit filtering logic in buildQueryFromCriteria() was incorrectly adding a duplicate session table join.

Changes

• src/Data/Query/SQLQueryEngine.php:
  • Pass $visitlist parameter to buildQueryFromCriteria() in getCandidateMatches() method
  • Remove duplicate session table join from buildQueryFromCriteria() - the session table is already joined by getFieldNameFromDict() when querying session-scoped fields
• modules/dataquery/php/query.class.inc: Remove FIXME comment and simplify visit list assignment since functionality is now verified

Testing Instructions

1. Navigate to the Data Query Tool
2. Select fields with session scope
3. Add a filter on a parameter and select only a subset of visits (e.g., only "V1" and "V2")
4. Run the query
5. Verify that results only include data from the specified visits
6. Compare with results when all visits are selected - should see different candidate counts

Related Issues

Resolves #10435