param.BigRational: fix BigRational.MONE definition

MONE is not used in the current code base.


git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@11750 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/param/BigRational.java

@@ -53,7 +53,7 @@ public final class BigRational implements Comparable<BigRational>
 	/** the BigRational "1" */
 	final static BigRational ONE = new BigRational(BigInteger.ONE);
 	/** the BigRational "-1" */
-	final static BigRational MONE = new BigRational(BigInteger.ONE);
+	final static BigRational MONE = new BigRational(BigInteger.ONE).negate();
 	/** the BigRational "0" */
 	final static BigRational ZERO = new BigRational(BigInteger.ZERO);
 	/** the BigRational "infinity" */