avcodec/x86/proresdsp_init: x86 prores IDCT is bitexact again

reenable it for for bitexact mode
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/x86/proresdsp_init.c

@@ -37,9 +37,6 @@ av_cold void ff_proresdsp_x86_init(ProresDSPContext *dsp, AVCodecContext *avctx)
 #if ARCH_X86_64
     int cpu_flags = av_get_cpu_flags();
 
-    if(avctx->flags & CODEC_FLAG_BITEXACT)
-        return;
-
     if (EXTERNAL_SSE2(cpu_flags)) {
         dsp->idct_permutation_type = FF_TRANSPOSE_IDCT_PERM;
         dsp->idct_put = ff_prores_idct_put_10_sse2;