Fix uninitialised memory read (adminModule) (meshtastic#6605)

Author: benkyd

src/graphics/Screen.cpp

@@ -1796,7 +1796,9 @@ void Screen::setup()
     powerStatusObserver.observe(&powerStatus->onNewStatus);
     gpsStatusObserver.observe(&gpsStatus->onNewStatus);
     nodeStatusObserver.observe(&nodeStatus->onNewStatus);
+#if !MESHTASTIC_EXCLUDE_ADMIN
     adminMessageObserver.observe(adminModule);
+#endif
     if (textMessageModule)
         textMessageObserver.observe(textMessageModule);
     if (inputBroker)
@@ -2857,4 +2859,4 @@ int Screen::handleAdminMessage(const meshtastic_AdminMessage *arg)
 } // namespace graphics
 #else
 graphics::Screen::Screen(ScanI2C::DeviceAddress, meshtastic_Config_DisplayConfig_OledType, OLEDDISPLAY_GEOMETRY) {}
-#endif // HAS_SCREEN
+#endif // HAS_SCREEN