Splash_screen: fix power on button dissapearing

screen.py

@@ -880,10 +880,10 @@ class KlipperScreen(Gtk.Window):
         self._ws.send_method(method, params)
 
     def printer_initializing(self, text=None, disconnect=False):
-        self.shutdown = True
         self.close_popup_message()
         self.show_panel('splash_screen', "splash_screen", "Splash Screen", 2)
         if disconnect is True and self.printer is not None:
+            self.shutdown = True
             self.printer.state = "disconnected"
         if text is not None:
             self.panels['splash_screen'].update_text(text)