Fix some systray issues on windows

Fix qTox not hiding when clicking on systray icon due to losing focus when clicking on the system tray

Fix the icon not being properly hidden on exit

Thanks to @toweI for reporting those issues

src/widget/widget.cpp

@@ -319,6 +319,7 @@ Widget::~Widget()
     core->saveConfiguration();
     AutoUpdater::abortUpdates();
     delete core;
+    icon->hide();
     hideMainForms();
     delete settingsWidget;
     delete addFriendForm;
@@ -609,10 +610,14 @@ void Widget::onIconClick(QSystemTrayIcon::ActivationReason reason)
                 show();
                 activateWindow();
             }
-            else if (isMinimized() || !isActiveWindow())
+            else if (isMinimized())
+            {
                 forceShow();
+            }
             else
+            {
                 hide();
+            }
 
             break;
         }