Customizer: missing sanitization callback function

[deshack]

Customizer : Sanitization of Customizer settings Found a Customizer setting that did not have a sanitization callback function in file customizer.php. Every call to the add_setting() method needs to have a sanitization callback function passed.

The Customizer APIs have been updated a lot since the latest update of Melany. We should completely support those APIs. Therefore, we should update our integration with the Customizer to fully support the most recent technology.

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