Fix 'bossac' upload on Windows (#19545)

Marlin/src/HAL/DUE/upload_extra_script.py

 
 	# Use bossac.exe on Windows
 	env.Replace(
-	    UPLOADCMD="bossac --info --unlock --write --verify --reset --erase -U false --boot"
+	    UPLOADCMD="bossac --info --unlock --write --verify --reset --erase -U false --boot $SOURCE"
 	)