builds per day: fix dynamic update to wrong result

the wrong dataset was updated, causing the graph to increase
the number of failed builds when a build succeeded and vice-versa.

src/resources/js/app.js

@@ -253,7 +253,7 @@ const Charts = (() => {
         }
       });
       c.jobCompleted = success => {
-        c.data.datasets[success ? 0 : 1].data[6]++;
+        c.data.datasets[success ? 1 : 0].data[6]++;
         c.update();
       }
       return c;