Refactor : drop unused var highScore .

Author: apetro

scratch/chapter4/bubble.html

@@ -10,13 +10,11 @@
                   69, 64, 66, 55, 52, 61,
                   46, 31, 57, 52, 44, 18,
                   41, 53, 55, 61, 51, 44];
-
-    var highScore = getHighScore(scores);
 
     printScores(scores);
 
     console.log("Quantity Bubbles tests: " + scores.length);
-    console.log("Highest bubble score: " + highScore);
+    console.log("Highest bubble score: " + getHighScore(scores) );
     console.log("Highest scoring solutions: " + bestSolutions(scores) );