avfilter/vf_scale: simplify color matrix parsing logic

No need to write a custom string parser when we can just use an integer
option with preset values. The various bits of fallback logic are wholly
redundant with equivalent logic already inside sws_getCoefficients.

Note: I disallowed setting 'out_color_matrix=auto', because this does
not do anything meaningful in the current code (just hard-codes
AVCOL_SPC_BT470BG fallback).

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