Use default to define a trivial constructor

Thanks clang-tidy.

src/bookmarkswidget.cpp

@@ -341,9 +341,7 @@ BookmarksWidget::BookmarksWidget(QWidget *parent)
     });
 }
 
-BookmarksWidget::~BookmarksWidget()
-{
-}
+BookmarksWidget::~BookmarksWidget() = default;
 
 void BookmarksWidget::setup()
 {

src/propertiesdialog.cpp

@@ -299,10 +299,7 @@ PropertiesDialog::PropertiesDialog(QWidget *parent)
         resize(s);
 }
 
-
-PropertiesDialog::~PropertiesDialog()
-{
-}
+PropertiesDialog::~PropertiesDialog() = default;
 
 void PropertiesDialog::accept()
 {

src/tab-switcher.cpp

@@ -104,8 +104,7 @@ TabSwitcher::TabSwitcher(TabWidget *tabs)
     connect(m_timer, &QTimer::timeout, this, &TabSwitcher::timer);
 }
 
-TabSwitcher::~TabSwitcher()
-{}
+TabSwitcher::~TabSwitcher() = default;
 
 void TabSwitcher::showSwitcher()
 {

src/terminalconfig.cpp

@@ -14,9 +14,7 @@ TerminalConfig::TerminalConfig(const QString &wdir, const QStringList &shell)
 {
 }
 
-TerminalConfig::TerminalConfig()
-{
-}
+TerminalConfig::TerminalConfig() = default;
 
 TerminalConfig::TerminalConfig(const TerminalConfig &cfg)
     : m_currentDirectory(cfg.m_currentDirectory),

src/termwidgetholder.cpp

@@ -61,9 +61,7 @@ TermWidgetHolder::TermWidgetHolder(TerminalConfig &config, QWidget * parent)
     setLayout(lay);
 }
 
-TermWidgetHolder::~TermWidgetHolder()
-{
-}
+TermWidgetHolder::~TermWidgetHolder() = default;
 
 void TermWidgetHolder::setInitialFocus()
 {