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Fix decision thresholds for larger frame sizes

Don't assume that frames larger than 20 ms save any overhead compared to 20 ms.

--- a/src/opus_encoder.c

+++ b/src/opus_encoder.c

@@ -808,7 +808,8 @@

    opus_int32 equiv;

    equiv = bitrate;

    /* Take into account overhead from smaller frames. */

-   equiv -= (40*channels+20)*(frame_rate - 50);

+   if (frame_rate > 50)

+      equiv -= (40*channels+20)*(frame_rate - 50);

    /* CBR is about a 8% penalty for both SILK and CELT. */

    if (!vbr)

       equiv -= equiv/12;