FIX: print-error dialog: hide cancel button, fix msg display

Change-Id: I26fe098cedd16ee568060f12bb5aea855e9ae279

src/slic3r/GUI/ConfirmHintDialog.hpp

@@ -27,9 +27,16 @@ private:
     void on_dpi_changed(const wxRect& suggested_rect) override;
 
 public:
+    enum ButtonStyle {
+        ONLY_CONFIRM = 0,
+        CONFIRM_AND_CANCEL = 1,
+        MAX_STYLE_NUM = 2
+    };
+
     ConfirmHintDialog(wxWindow* parent,
         wxWindowID      id = wxID_ANY,
         const wxString& title = wxEmptyString,
+        enum ButtonStyle btn_style = CONFIRM_AND_CANCEL,
         const wxPoint& pos = wxDefaultPosition,
         const wxSize& size = wxDefaultSize,
         long            style = wxCLOSE_BOX | wxCAPTION);