Remove obsolete TODO

DEVSIX-4389

Author: Snipx

src/test/java/com/itextpdf/html2pdf/css/w3c/css_backgrounds/BackgroundColorPaddingBoxTest.java

@@ -25,7 +25,6 @@ This file is part of the iText (R) project.
 import com.itextpdf.html2pdf.css.w3c.W3CCssTest;
 
 // TODO DEVSIX-2105 support background-clip
-// TODO DEVSIX-4389 support background-color
 public class BackgroundColorPaddingBoxTest extends W3CCssTest {
     @Override
     protected String getHtmlFileName() {