fixed crash on cx16 in word to float conversion

compiler/res/prog8lib/cx16/floats.p8

@@ -99,9 +99,9 @@ _flt65536    .byte 145,0,0,0,0       ; 65536.0
 asmsub  GIVAYFAY  (uword value @ AY) clobbers(A,X,Y)  {
 	; ---- signed 16 bit word in A/Y (lo/hi) to float in fac1
 	%asm {{
-		sta  P8ZP_SCRATCH_W2
+		sta  P8ZP_SCRATCH_B1
 		tya
-		ldy  P8ZP_SCRATCH_W2
+		ldy  P8ZP_SCRATCH_B1
 		jmp  GIVAYF		; this uses the inverse order, Y/A
 	}}
 }
@@ -110,9 +110,9 @@ asmsub  FTOSWRDAY  () clobbers(X) -> uword @ AY  {
 	; ---- fac1 to signed word in A/Y
 	%asm {{
 		jsr  FTOSWORDYA	; note the inverse Y/A order
-		sta  P8ZP_SCRATCH_REG
+		sta  P8ZP_SCRATCH_B1
 		tya
-		ldy  P8ZP_SCRATCH_REG
+		ldy  P8ZP_SCRATCH_B1
 		rts
 	}}
 }

examples/test.p8

@@ -10,15 +10,16 @@ main {
     sub start () {
 
         word ww
-        float x_f = -300.0
         float y_f
+        float fl
         for ww in -300 to 300 {         ; TODO fix crash if ww is not defined
-            ;fl = ww as float         ; TODO doesn't work???
-            y_f = cos(x_f/30.0)*60 - x_f/1.7
-            ; gfx2.plot(ww + 320 as uword, (y_f + 240) as uword, 1)
-            x_f += 1.0
+            fl = ww as float
+            floats.print_f(fl)
+            txt.chrout(' ')
         }
 
+        test_stack.test()
+
     }