Remove usage of titlebar icons (#9932)

* ibit

* update

* Update RecenterDialog.cpp

* Update AboutDialog.cpp

src/slic3r/GUI/RecenterDialog.cpp

@@ -14,9 +14,6 @@ namespace Slic3r { namespace GUI {
 RecenterDialog::RecenterDialog(wxWindow* parent, wxWindowID id, const wxString& title, const wxPoint& pos, const wxSize& size, long style)
       : DPIDialog(parent, id, _L("Confirm"), pos, size, style)
 {
-    std::string icon_path = (boost::format("%1%/images/OrcaSlicerTitle.ico") % resources_dir()).str();
-    SetIcon(wxIcon(encode_path(icon_path.c_str()), wxBITMAP_TYPE_ICO));
-
     hint1 = _L("Please home all axes (click ");
     hint2 = _L(") to locate the toolhead's position. This prevents device moving beyond the printable boundary and causing equipment wear.");