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Increase surround allocation offset for smaller frame sizes

--- a/src/opus_multistream_encoder.c

+++ b/src/opus_multistream_encoder.c

@@ -613,10 +613,11 @@

       stream_offset = 20000;

    else

       stream_offset = st->bitrate_bps/st->layout.nb_channels/2;

+   stream_offset += 60*(Fs/frame_size-50);

    /* We start by giving each stream (coupled or uncoupled) the same bitrate.

       This models the main saving of coupled channels over uncoupled. */

    /* The LFE stream is an exception to the above and gets fewer bits. */

-   lfe_offset = 3500;

+   lfe_offset = 3500 + 60*(Fs/frame_size-50);

    /* Coupled streams get twice the mono rate after the first 20 kb/s. */

    coupled_ratio = 512;

    /* Should depend on the bitrate, for now we assume LFE gets 1/8 the bits of mono */