fix: revert the 1.2.1 change

The code here https://github.com/remy/next-ayfx/compare/1.2.0..1.2.1 causes extreme crunchy sounds on cspect and god knows what on the hardware.
remy · Feb 8, 2021 · 6780034 · 6780034
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commit 6780034
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diff --git a/VERSION b/VERSION
@@ -1 +1 @@
-1.2.1
+1.2.2
diff --git a/ayfx.drv b/ayfx.drv
diff --git a/example/ayfx.drv b/example/ayfx.drv
diff --git a/src/ayfx.asm b/src/ayfx.asm
@@ -309,8 +309,8 @@ afxFrame1
 	jr z,afxFrame3		        ; noise didn't change
 
 	ld a,(hl)			; read noise word
-	cp #20
-	jr nz,afxFrame2		        ; less than # 20, play on
+	sub #20
+	jr c,afxFrame2		        ; less than # 20, play on
 	ld h,a				; otherwise end of the effect
 	ld b,#ff
 	ld b,c				; in BC we enter the longest time