corrected wrong source of mantissa during division

c64/basic/math/bb12.div_FAC2_FAC1.s

@@ -76,13 +76,13 @@ div_FAC2_FAC1:
 
 	// Copy the result to FAC1 - XXX we probably already have similar code somewhere...
 
-	lda RESHO+3
+	sta FAC2_mantissa+3
 	sta FAC1_mantissa+3
-	lda RESHO+2
+	sta FAC2_mantissa+2
 	sta FAC1_mantissa+2
-	lda RESHO+1
+	sta FAC2_mantissa+1
 	sta FAC1_mantissa+1
-	lda RESHO+0
+	sta FAC2_mantissa+0
 	sta FAC1_mantissa+0
 
 	lda #$00