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fix equivalent bitrate calculation for <20ms frame sizes

Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Mark Harris <mark.hsj@gmail.com>

--- a/celt/celt_encoder.c

+++ b/celt/celt_encoder.c

@@ -1571,7 +1571,7 @@

                (tmp+4*mode->Fs)/(8*mode->Fs)-!!st->signalling));

       effectiveBytes = nbCompressedBytes - nbFilledBytes;

    }

-   equiv_rate = ((opus_int32)nbCompressedBytes*8*50 >> (3-LM)) - (40*C+20)*((400>>LM) - 50);

+   equiv_rate = ((opus_int32)nbCompressedBytes*8*50 << (3-LM)) - (40*C+20)*((400>>LM) - 50);

    if (st->bitrate != OPUS_BITRATE_MAX)

       equiv_rate = IMIN(equiv_rate, st->bitrate - (40*C+20)*((400>>LM) - 50));