[qtconsole] fix append_plain_html -> append_html

IPython/frontend/qt/console/console_widget.py

@@ -1670,7 +1670,7 b' class ConsoleWidget(LoggingConfigurable, QtGui.QWidget):'
                 else:
                     self.layout().setCurrentWidget(self._page_control)
         elif html:
-            self._append_plain_html(text)
+            self._append_html(text)
         else:
             self._append_plain_text(text)