zstd: Default to full zero frames (#1134)

Probably easiest to reference this: klauspost/stdgozstd#1

The decoder still accepts both.

Author: klauspost

zstd/encoder_options.go

@@ -42,6 +42,7 @@ func (o *encoderOptions) setDefault() {
 		level:         SpeedDefault,
 		allLitEntropy: false,
 		lowMem:        false,
+		fullZero:      true,
 	}
 }