Minor fix to getValue (thanks Ryan!)

git-svn-id: file:///humgen/gsa-scr1/gsa-engineering/svn_contents/trunk@2404 348d0f76-0448-11de-a6fe-93d51630548a

java/src/org/broadinstitute/sting/gatk/walkers/recalibration/PairedReadOrderCovariate.java

@@ -18,7 +18,7 @@ public class PairedReadOrderCovariate implements ExperimentalCovariate{
     }
 
     public final Comparable getValue( final String str ) {
-        return str.hashCode();
+        return str;
     }
 
     // Used to estimate the amount space required for the full data HashMap