[PD] make pointers to the UI std::unique_ptr

Same as PR #4293, just for PartDesign

as noted in https://github.com/FreeCAD/FreeCAD/pull/4271#discussion_r554673632
the pointer to the UI should be a unique pointer.

This PR does this for all PartDesign dialogs that don't already use a unique_ptr.

src/Mod/PartDesign/Gui/TaskPolarPatternParameters.cpp

@@ -61,11 +61,11 @@ using namespace Gui;
 /* TRANSLATOR PartDesignGui::TaskPolarPatternParameters */
 
 TaskPolarPatternParameters::TaskPolarPatternParameters(ViewProviderTransformed *TransformedView,QWidget *parent)
-        : TaskTransformedParameters(TransformedView, parent)
+    : TaskTransformedParameters(TransformedView, parent)
+    , ui(new Ui_TaskPolarPatternParameters)
 {
     // we need a separate container widget to add all controls to
     proxy = new QWidget(this);
-    ui = new Ui_TaskPolarPatternParameters();
     ui->setupUi(proxy);
     QMetaObject::connectSlotsByName(this);
 
@@ -81,10 +81,9 @@ TaskPolarPatternParameters::TaskPolarPatternParameters(ViewProviderTransformed *
 }
 
 TaskPolarPatternParameters::TaskPolarPatternParameters(TaskMultiTransformParameters *parentTask, QLayout *layout)
-        : TaskTransformedParameters(parentTask)
+        : TaskTransformedParameters(parentTask), ui(new Ui_TaskPolarPatternParameters)
 {
     proxy = new QWidget(parentTask);
-    ui = new Ui_TaskPolarPatternParameters();
     ui->setupUi(proxy);
     connect(ui->buttonOK, SIGNAL(pressed()),
             parentTask, SLOT(onSubTaskButtonOK()));
@@ -406,7 +405,6 @@ TaskPolarPatternParameters::~TaskPolarPatternParameters()
         Base::Console().Error ("%s\n", ex.what () );
     }
 
-    delete ui;
     if (proxy)
         delete proxy;
 }