Fix replaying same song if Repeat is off and Skip button is pressed while on the last song in the list

app/src/main/java/com/kabouzeid/gramophone/service/MusicService.java

@@ -675,7 +675,11 @@ public int getNextPosition(boolean force) {
                 break;
             default:
             case REPEAT_MODE_NONE:
-                if (isLastTrack()) {
+                if (force) {
+                    if (isLastTrack()) {
+                        position = 0;
+                    }
+                } else {
                     position -= 1;
                 }
                 break;