DolphinQt/InputCommon: Fix a few memory leaks.

Source/Core/DolphinQt/QtUtils/DoubleClickEventFilter.cpp

@@ -6,6 +6,10 @@
 
 #include "DolphinQt/QtUtils/DoubleClickEventFilter.h"
 
+DoubleClickEventFilter::DoubleClickEventFilter(QObject* parent) : QObject(parent)
+{
+}
+
 bool DoubleClickEventFilter::eventFilter(QObject* object, QEvent* event)
 {
   if (event->type() == QEvent::MouseButtonDblClick)

Source/Core/DolphinQt/QtUtils/DoubleClickEventFilter.h

@@ -9,6 +9,9 @@
 class DoubleClickEventFilter : public QObject
 {
   Q_OBJECT
+public:
+  explicit DoubleClickEventFilter(QObject* parent);
+
 signals:
   void doubleClicked();
 

Source/Core/DolphinQt/QtUtils/WindowActivationEventFilter.cpp

@@ -7,6 +7,10 @@
 
 #include "DolphinQt/QtUtils/WindowActivationEventFilter.h"
 
+WindowActivationEventFilter::WindowActivationEventFilter(QObject* parent) : QObject(parent)
+{
+}
+
 bool WindowActivationEventFilter::eventFilter(QObject* object, QEvent* event)
 {
   if (event->type() == QEvent::WindowDeactivate)

Source/Core/DolphinQt/QtUtils/WindowActivationEventFilter.h

@@ -9,6 +9,9 @@
 class WindowActivationEventFilter : public QObject
 {
   Q_OBJECT
+public:
+  explicit WindowActivationEventFilter(QObject* parent);
+
 signals:
   void windowActivated();
   void windowDeactivated();