Use border style consistently in the widgets sample

Use GetAttrs().m_defaultFlags everywhere when creating the widgets, it
was done for some but not all of them before, without any apparent
reason.

This should make setting various border styles work (for the widgets
supporting them).

samples/widgets/dirpicker.cpp

@@ -83,9 +83,6 @@ protected:
     // restore the checkboxes state to the initial values
     void Reset();
 
-    // get the initial style for the picker of the given kind
-    long GetPickerStyle();
-
 
     void OnDirChange(wxFileDirPickerEvent &ev);
     void OnCheckBox(wxCommandEvent &ev);
@@ -194,15 +191,7 @@ void DirPickerWidgetsPage::CreatePicker()
 {
     delete m_dirPicker;
 
-    m_dirPicker = new wxDirPickerCtrl(this, PickerPage_Dir,
-                                        wxGetHomeDir(), wxT("Hello!"),
-                                        wxDefaultPosition, wxDefaultSize,
-                                        GetPickerStyle());
-}
-
-long DirPickerWidgetsPage::GetPickerStyle()
-{
-    long style = 0;
+    long style = GetAttrs().m_defaultFlags;
 
     if ( m_chkDirTextCtrl->GetValue() )
         style |= wxDIRP_USE_TEXTCTRL;
@@ -216,7 +205,10 @@ long DirPickerWidgetsPage::GetPickerStyle()
     if ( m_chkSmall->GetValue() )
         style |= wxDIRP_SMALL;
 
-    return style;
+    m_dirPicker = new wxDirPickerCtrl(this, PickerPage_Dir,
+                                      wxGetHomeDir(), wxT("Hello!"),
+                                      wxDefaultPosition, wxDefaultSize,
+                                      style);
 }
 
 void DirPickerWidgetsPage::RecreatePicker()