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Attempt to have at least two bands that are coded

This fixes a SWB hybrid issue where band 18 isn't folded and cannot even
be folded because it's wider than band 17. This was causing noise to
be injected instead.

--- a/celt/rate.c

+++ b/celt/rate.c

@@ -353,7 +353,7 @@

 #ifdef FUZZING

             if ((rand()&0x1) == 0)

 #else

-            if (band_bits > ((j<prev?7:9)*band_width<<LM<<BITRES)>>4)

+            if (codedBands<=start+2 || band_bits > ((j<prev?7:9)*band_width<<LM<<BITRES)>>4)

 #endif

             {

                ec_enc_bit_logp(ec, 1, 1);