fix: prevent crash when PSLab board is connected to phone before first app start (#2575)

Author: marcnause

app/src/main/java/io/pslab/activity/MainActivity.java

@@ -477,7 +477,7 @@ public void run() {
     private void attemptToGetUSBPermission() {
         if (!("android.hardware.usb.action.USB_DEVICE_ATTACHED".equals(getIntent().getAction()))) {
             if (communicationHandler.isDeviceFound() && !usbManager.hasPermission(communicationHandler.mUsbDevice)) {
-                mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
+                mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), PendingIntent.FLAG_IMMUTABLE);
                 IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
                 registerReceiver(mUsbReceiver, filter);
                 receiverRegister = true;