Fix music app :

- Enable LVGL animation (and disable groups, which were not used), and set the speed.
 - Fix disc animation and progress display by initializing lastIncrement at 0 (a random value will be used otherwise, in release build)

src/libs/lv_conf.h

@@ -140,7 +140,7 @@ typedef int16_t lv_coord_t;
  *==================*/
 
 /*1: Enable the Animations */
-#define LV_USE_ANIMATION        0
+#define LV_USE_ANIMATION        1
 #if LV_USE_ANIMATION
 
 /*Declare the type of the user data of animations (can be e.g. `void *`, `int`, `struct`)*/
@@ -177,7 +177,7 @@ typedef void* lv_anim_user_data_t;
 #define LV_USE_IMG_TRANSFORM    0
 
 /* 1: Enable object groups (for keyboard/encoder navigation) */
-#define LV_USE_GROUP            1
+#define LV_USE_GROUP            0
 #if LV_USE_GROUP
 typedef void* lv_group_user_data_t;
 #endif  /*LV_USE_GROUP*/