resolve #2364

- fix wrong debug print
- change shutdown logic for t-beam if PMU is detected
- wait for 10 seconds instead of 5 for shutdown and resurrect screen brightness adjust for @karamo

src/Power.cpp

@@ -277,12 +277,11 @@ void Power::shutdown()
     LOG_INFO("Shutting down\n");
 
 #ifdef HAS_PMU
-    if (PMU) {
+    if (pmu_found == true) {
         PMU->setChargingLedMode(XPOWERS_CHG_LED_OFF);
+        PMU->shutdown();
     }
-#endif
-
-#if defined(ARCH_NRF52) || defined(ARCH_ESP32)
+#elif defined(ARCH_NRF52) || defined(ARCH_ESP32)
 #ifdef PIN_LED1
     ledOff(PIN_LED1);
 #endif