Remove Qt5 to-do comment in qtexthtmlparser.cpp.

The comment relates to a change that is neither source- nor
binary-incompatible, so the change can be done in any minor release.

Task-number: QTBUG-25117
Change-Id: Ifba3ef53241f9bf2504c573066e4cfa5fbfe679e
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@nokia.com>

src/gui/text/qtexthtmlparser.cpp

@@ -1051,7 +1051,7 @@ void QTextHtmlParserNode::initializeProperties(const QTextHtmlParserNode *parent
                     && !attributes.at(i + 1).isEmpty()) {
                     hasHref = true;
                     charFormat.setUnderlineStyle(QTextCharFormat::SingleUnderline);
-                    charFormat.setForeground(Qt::blue); // ### Qt5: QApplication::palette().link());
+                    charFormat.setForeground(Qt::blue);
                 }
             }