Clear `input.filter` if there is no search value.

Resolve #10532

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared/wwwroot/libs/abp/aspnetcore-mvc-ui-theme-shared/datatables/datatables-extensions.js

@@ -368,6 +368,8 @@ var abp = abp || {};
                 //Text filter
                 if (requestData.search && requestData.search.value !== "") {
                     input.filter = requestData.search.value;
+                } else {
+                    input.filter = null;       
                 }
 
                 if (callback) {