avfilter/vf_deshake: use a void * comparator for consistency

For generality, qsort uses a comparator whose elements are void *. This
makes the comparator have such a form, and thus makes the void * cast of
the comparator pointer useless. Furthermore, this makes the code more
consistent with other usages of qsort across the codebase.

Reviewed-by: Henrik Gramner <[email protected]>
Reviewed-by: wm4 <[email protected]>
Signed-off-by: Ganesh Ajjanagadde <[email protected]>

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