fix(pl18): prevent hang when pressing power button during USB charging (#7404)

radio/src/targets/pl18/battery_driver.cpp

@@ -443,9 +443,11 @@ void drawChargingInfo(uint16_t chargeState) {
 
 void battery_charge_end()
 {
-  chargeWindow->clear();
-  delete chargeWindow;
-  chargeWindow = nullptr;
+  if (chargeWindow) {
+    chargeWindow->clear();
+    delete chargeWindow;
+    chargeWindow = nullptr;
+  }
 }
 
 #define CHARGE_INFO_DURATION 5000 // ms

radio/src/targets/pl18/board.cpp

@@ -252,6 +252,7 @@ void boardInit()
         if ((now - press_start) > POWER_ON_DELAY) {
           break;
         }
+        delay_ms(10);
       } else if (!isChargerActive()) {
         boardOff();
       } else {