Fix widgets default preview image in single listing sidebar

[Arafat-plugins]

PR Type

What kind of change does this PR introduce?

• Bugfix
• Security fix
• Improvement
• New Feature
• Refactoring (no functional changes, no api changes)
• Build related changes
• Text changes
• Other... Please describe:

Description

How to reproduce the issue or how to test the changes

1. In Directorist, set a directory-specific Default listing preview image in the directory builder General settings.
2. Create a featured/popular/similar listing without uploading a preview image or gallery image.
3. Open the single listing page and check the sidebar widgets.
4. Before this change, the widgets used Directorist's placeholder grid.jpg instead of the user-configured default listing preview image.
5. After this change, the widgets now use the directory-specific default preview image first, and only fall back to the placeholder if no default image is configured.

Any linked issues

Fixes # https://taiga-sovware-u10698.vm.elestio.app/project/directorist/issue/2891

Screenshot

• https://prnt.sc/FOBdEpKfnhTb

Checklist

• My code follows the WordPress coding standards