Mapping: Google API key is not used in custom filter dialog

**Describe the bug**
When a Google API key is added for mapping, it is correctly used on the contact/post detail page for searching locations. However, when creating a custom filter on the Location field, the input is using the DT API `/wp-json/dt/v1/mapping_module/search_location_grid_by_name` instead of `https://maps.googleapis.com/maps/api/place/js/AutocompletionService.GetPredictionsJson`

**To Reproduce**
Steps to reproduce the behavior:
1. Add Google API key for Mapping
2. On Contact list page, click "Create custom filter"
3. Select location field
4. Search for "Bourj Hammoud, Lebanon" and monitor network traffic

**Expected behavior**
Custom filter location search should use Google geocoding service and thus return "Bourj Hammoud, Lebanon"

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Disciple.Tools Theme:**
- version: 1.62.1
- setup: single site (WPEngine)

**Device and browser (please complete the following information):**
- Device: MacBook
- OS: macos 14.4.1
- Browser: Chrome
- Version: 124.0.6367.158