Services: Use default constructors/destructors

https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules

"The compiler is more likely to get the default semantics right and
you cannot implement these functions better than the compiler."

Userland/Services/Taskbar/ClockWidget.cpp

@@ -159,10 +159,6 @@ ClockWidget::ClockWidget()
     };
 }
 
-ClockWidget::~ClockWidget()
-{
-}
-
 void ClockWidget::paint_event(GUI::PaintEvent& event)
 {
     GUI::Frame::paint_event(event);

Userland/Services/Taskbar/ClockWidget.h

@@ -22,7 +22,7 @@ class ClockWidget final : public GUI::Frame {
     C_OBJECT(ClockWidget);
 
 public:
-    virtual ~ClockWidget() override;
+    virtual ~ClockWidget() override = default;
 
 private:
     ClockWidget();

Userland/Services/Taskbar/QuickLaunchWidget.cpp

@@ -112,10 +112,6 @@ QuickLaunchWidget::QuickLaunchWidget()
     }
 }
 
-QuickLaunchWidget::~QuickLaunchWidget()
-{
-}
-
 OwnPtr<QuickLaunchEntry> QuickLaunchEntry::create_from_config_value(StringView value)
 {
     if (!value.starts_with("/") && value.ends_with(".af")) {

Userland/Services/Taskbar/QuickLaunchWidget.h

@@ -78,7 +78,7 @@ class QuickLaunchWidget : public GUI::Frame
     C_OBJECT(QuickLaunchWidget);
 
 public:
-    virtual ~QuickLaunchWidget() override;
+    virtual ~QuickLaunchWidget() override = default;
 
     virtual void config_key_was_removed(String const&, String const&, String const&) override;
     virtual void config_string_did_change(String const&, String const&, String const&, String const&) override;

Userland/Services/Taskbar/ShutdownDialog.cpp

@@ -117,7 +117,3 @@ ShutdownDialog::ShutdownDialog()
     // Request WindowServer to re-update us on the current theme as we might've not been alive for the last notification.
     refresh_system_theme();
 }
-
-ShutdownDialog::~ShutdownDialog()
-{
-}

Userland/Services/Taskbar/ShutdownDialog.h

@@ -17,7 +17,7 @@ public:
 
 private:
     ShutdownDialog();
-    virtual ~ShutdownDialog() override;
+    virtual ~ShutdownDialog() override = default;
 
     int m_selected_option { -1 };
 };

Userland/Services/Taskbar/TaskbarButton.cpp

@@ -19,10 +19,6 @@ TaskbarButton::TaskbarButton(const WindowIdentifier& identifier)
 {
 }
 
-TaskbarButton::~TaskbarButton()
-{
-}
-
 void TaskbarButton::context_menu_event(GUI::ContextMenuEvent&)
 {
     GUI::ConnectionToWindowMangerServer::the().async_popup_window_menu(

Userland/Services/Taskbar/TaskbarButton.h

@@ -12,7 +12,7 @@
 class TaskbarButton final : public GUI::Button {
     C_OBJECT(TaskbarButton)
 public:
-    virtual ~TaskbarButton() override;
+    virtual ~TaskbarButton() override = default;
 
     void update_taskbar_rect();
     void clear_taskbar_rect();

Userland/Services/Taskbar/TaskbarWindow.cpp

@@ -30,10 +30,10 @@ class TaskbarWidget final : public GUI::Widget {
     C_OBJECT(TaskbarWidget);
 
 public:
-    virtual ~TaskbarWidget() override { }
+    virtual ~TaskbarWidget() override = default;
 
 private:
-    TaskbarWidget() { }
+    TaskbarWidget() = default;
 
     virtual void paint_event(GUI::PaintEvent& event) override
     {
@@ -99,10 +99,6 @@ TaskbarWindow::TaskbarWindow(NonnullRefPtr<GUI::Menu> start_menu)
     m_assistant_app_file = Desktop::AppFile::open(af_path);
 }
 
-TaskbarWindow::~TaskbarWindow()
-{
-}
-
 void TaskbarWindow::show_desktop_button_clicked(unsigned)
 {
     GUI::ConnectionToWindowMangerServer::the().async_toggle_show_desktop();

Userland/Services/Taskbar/TaskbarWindow.h

@@ -18,7 +18,7 @@ class TaskbarWindow final : public GUI::Window {
     C_OBJECT(TaskbarWindow);
 
 public:
-    virtual ~TaskbarWindow() override;
+    virtual ~TaskbarWindow() override = default;
 
     static int taskbar_height() { return 27; }
     static int taskbar_icon_size() { return 16; }