vpxdec: fix --keep-going with --disable-vp8
vpxdec: fix --keep-going with --disable-vp8

the parsing of this flag was mistakenly put in a CONFIG_VP8_DECODER
conditional block in:
95853db vpxdec: add --keep-going option

Change-Id: Ie83ca0399fd3f3d4b0a9d03b7ca5536b310e1f02

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