Added appropriate AcceptMode to AcceptSave so the OpenFileSave shows the...

Added appropriate AcceptMode to AcceptSave so the OpenFileSave shows the proper Save button instead of the default Open button.

src/QGCFileDialog.cc

@@ -100,6 +100,7 @@ QString QGCFileDialog::getSaveFileName(QWidget* parent,
 #endif
     {
         QFileDialog dlg(parent, caption, dir, filter);
+        dlg.setAcceptMode(QFileDialog::AcceptSave);
         if (selectedFilter)
             dlg.selectNameFilter(*selectedFilter);
         if (options)