Add prolong-time on press of "Start" when cooking

By adding the ability to extend the cooking time during a cooking cycle, the microwave now allows users to prolong the duration of their dish. This feature is accessible by simply pressing the start button during cooking, which will add a designated amount of seconds to the remaining time. The new remaining cooking time will then be displayed on the oven's interface, providing users with clear and accurate information about the status of their dish. Be aware, that the start button doesn't cancel and reset the microwave anymore, as it now extends the time.