15210-Fixed product tier pricing pagination

- Fix prevPage and nextPage method. Calling clear method was added to changePage method.

Author: VladimirZaets

app/code/Magento/Ui/view/base/web/js/dynamic-rows/dynamic-rows.js

@@ -764,15 +764,13 @@ define([
          * Change page to next
          */
         nextPage: function () {
-            this.clear();
             this.currentPage(this.currentPage() + 1);
         },
 
         /**
          * Change page to previous
          */
         previousPage: function () {
-            this.clear();
             this.currentPage(this.currentPage() - 1);
         },