simplify greedy2frame deinterlacer a bit

Cuts roughly 10% of the instructions (with sse), results should be
identical.
Not sure why it was that complicated in the first place, the
simplification is possible because the code gave a score of 1 to top and
bottom comparisons, and 2 for the middle one, and weaved when all scores
added together were more than 2. This is equivalent to weave when
(cmp(m) AND (cmp(b) OR cmp(t))) which is a much better match for the
available hw instructions. This also reduces the number of constant
loads a lot, and the patch moves up some memory loads a bit which can
never hurt.

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