Revert changes in normalize method because it affected ajax validation

Ajax validation uses Html::getInputId to generate the input ID, which in turn converts the string to lower case. This is why if we remove the same behavior from BaseColumn::normalize, the ajax validation will not work because the input (attribute) IDs from the ajax response will not match the form input IDs generated by our widget.

CHANGELOG.md

@@ -4,6 +4,7 @@ Yii2 multiple input change log
 2.29.0 (in development)
 =======================
 - fix addind active form fields doesn't work properly in case of 10 rows and more (unclead)
+- revert changes in normalize method because it affected ajax validation
 
 2.28.0
 =======================

src/components/BaseColumn.php

@@ -280,7 +280,7 @@ abstract public function getElementName($index, $withPrefix = true);
      * @return mixed
      */
     private function normalize($name) {
-        return str_replace(['[]', '][', '[', ']', ' ', '.'], ['', '-', '-', '', '-', '-'], $name);
+        return str_replace(['[]', '][', '[', ']', ' ', '.'], ['', '-', '-', '', '-', '-'], strtolower($name));
     }
 
     /**