Mesh: modernize C++: use equals default

src/Mod/Mesh/Gui/RemoveComponents.cpp

@@ -211,9 +211,7 @@ RemoveComponentsDialog::RemoveComponentsDialog(QWidget* parent, Qt::WindowFlags
     hboxLayout->addWidget(buttonBox);
 }
 
-RemoveComponentsDialog::~RemoveComponentsDialog()
-{
-}
+RemoveComponentsDialog::~RemoveComponentsDialog() = default;
 
 void RemoveComponentsDialog::reject()
 {
@@ -249,11 +247,6 @@ TaskRemoveComponents::TaskRemoveComponents()
     Content.push_back(taskbox);
 }
 
-TaskRemoveComponents::~TaskRemoveComponents()
-{
-    // automatically deleted in the sub-class
-}
-
 void TaskRemoveComponents::modifyStandardButtons(QDialogButtonBox* box)
 {
     QPushButton* btn = box->button(QDialogButtonBox::Ok);