avcodec/executor: remove unused ready callback

Due to the nature of multithreading, using a "ready check" mechanism may introduce a deadlock. For example:

Suppose all tasks have been submitted to the executor, and the last thread checks the entire list and finds
no ready tasks. It then goes to sleep, waiting for a new task. However, for some multithreading-related reason,
a task becomes ready after the check. Since no other thread is aware of this and no new tasks are being added to
the executor, a deadlock occurs.

In VVC, this function is unnecessary because we use a scoreboard. All tasks submitted to the executor are ready tasks.

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