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Tuning the allocation trim_offset for shorter frames

--- a/libcelt/rate.c

+++ b/libcelt/rate.c

@@ -285,7 +285,7 @@

       thresh[j] = 2*(C*(m->eBands[j+1]-m->eBands[j])<<LM<<BITRES)>>3;

    /* Tilt of the allocation curve */

    for (j=start;j<end;j++)

-      trim_offset[j] = C*(m->eBands[j+1]-m->eBands[j])*(2*alloc_trim-4-LM)*(m->nbEBands-j-1)

+      trim_offset[j] = C*(m->eBands[j+1]-m->eBands[j])*(2*alloc_trim-1-2*LM)*(m->nbEBands-j-1)

             <<(LM+BITRES)>>6;

    lo = 0;