Update DefaultVectorUtilSupport.java

silly error in jdk11 test path

Author: shyla226

jvector-base/src/main/java/io/github/jbellis/jvector/vector/DefaultVectorUtilSupport.java

@@ -652,7 +652,7 @@ public float pqScoreCosine(VectorFloat<?>[] codebooks, int[][] subvectorSizesAnd
       var codebookOffset = centroidIndex * centroidLength;
       sum += dotProduct(codebooks[m], codebookOffset, centeredQuery, centroidOffset, centroidLength);
       aMagnitude += dotProduct(codebooks[m], codebookOffset, codebooks[m], codebookOffset, centroidLength);
-      aMagnitude += dotProduct(centeredQuery, centroidOffset, centeredQuery, centroidOffset, centroidLength);
+      bMagnitude += dotProduct(centeredQuery, centroidOffset, centeredQuery, centroidOffset, centroidLength);
    }
    float cosine = sum / (float) Math.sqrt(aMagnitude * bMagnitude);
    return cosine;