Add "processData: false" to all JSON data we send

Signed-off-by: DL6ER <dl6er@dl6er.de>

scripts/pi-hole/js/settings.js

@@ -137,6 +137,8 @@ function saveSettings() {
   $.ajax({
     url: "/api/config",
     method: "PATCH",
+    dataType: "json",
+    processData: false,
     data: JSON.stringify({ config: settings }),
     contentType: "application/json; charset=utf-8",
   })