Use another compound assignment operator

[elfring]

:eyes: Some source code analysis tools can help to find opportunities for improving software components. :thought_balloon: I propose to increase the usage of compound operators accordingly.

diff --git a/app/src/main/java/com/kabouzeid/gramophone/util/MusicUtil.java b/app/src/main/java/com/kabouzeid/gramophone/util/MusicUtil.java
index f7bd539d..ad8478d0 100644
--- a/app/src/main/java/com/kabouzeid/gramophone/util/MusicUtil.java
+++ b/app/src/main/java/com/kabouzeid/gramophone/util/MusicUtil.java
@@ -149,7 +149,7 @@ public class MusicUtil {
             return String.format(Locale.getDefault(), "%01d:%02d", minutes, seconds);
         } else {
             long hours = minutes / 60;
-            minutes = minutes % 60;
+            minutes %= 60;
             return String.format(Locale.getDefault(), "%d:%02d:%02d", hours, minutes, seconds);
         }
     }