Finalize code related to form fields renderers separation

DEVSIX-7385

Author: Eugene Bochilo

src/test/java/com/itextpdf/html2pdf/element/FormTest.java

@@ -22,7 +22,6 @@ This file is part of the iText (R) project.
  */
 package com.itextpdf.html2pdf.element;
 
-import com.itextpdf.commons.utils.ExperimentalFeatures;
 import com.itextpdf.forms.PdfAcroForm;
 import com.itextpdf.forms.logs.FormsLogMessageConstants;
 import com.itextpdf.html2pdf.ConverterProperties;