Fixed another bug with calculating pixels changed

app/src/main/java/com/example/ueberwachungssystem/Detection/VideoDetector.java

@@ -224,7 +224,7 @@ public class VideoDetector extends Detector {
 
                 int n = OpenCVHelper.countNonZeroPixels(processed);
                 int pixelCount = image.getWidth() * image.getHeight();
-                float percentChanged = (float) (n / pixelCount) * 100;
+                float percentChanged = ((float) n / pixelCount) * 100;
 
                 // Violation Condition
                 if (percentChanged> ALARM_THRESHOLD) {