Fix 3505 Special Chars in Path

- thanks to @marams for the patch.

src/Mod/TechDraw/Gui/Command.cpp

@@ -208,7 +208,7 @@ void CmdTechDrawNewPage::activated(int iMsg)
 
         //why is "Template" property set twice? -wf
         // once to set DrawSVGTemplate.Template to OS template file name
-        doCommand(Doc,"App.activeDocument().%s.Template = '%s'",TemplateName.c_str(), templateFileName.toStdString().c_str());
+        doCommand(Doc,"App.activeDocument().%s.Template = \"%s\"",TemplateName.c_str(), templateFileName.toUtf8().constData());
         // once to set Page.Template to DrawSVGTemplate.Name
         doCommand(Doc,"App.activeDocument().%s.Template = App.activeDocument().%s",PageName.c_str(),TemplateName.c_str());
         // consider renaming DrawSVGTemplate.Template property?