Add Q_OBJECT macro to two more classes

These also showed up as concerns when creating translation strings.
Adding them thankfully didn't create new strings, but not having them
potentially leads to incorrect runtime behavior.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

desktop-widgets/simplewidgets.h

@@ -203,6 +203,7 @@ public:
 };
 
 class TextHyperlinkEventFilter : public QObject {
+	Q_OBJECT
 public:
 	explicit TextHyperlinkEventFilter(QTextEdit *txtEdit);
 

qt-models/yearlystatisticsmodel.cpp

@@ -5,6 +5,7 @@
 #include "core/statistics.h"
 
 class YearStatisticsItem : public TreeItem {
+	Q_OBJECT
 public:
 	enum {
 		YEAR,