[player/db] Increment queue version if shuffle mode is turned off

This fixes showing the wrong queue in the player web interface after
turing shuffle mode off.

src/db.h

@@ -853,6 +853,9 @@ db_queue_move_byposrelativetoitem(uint32_t from_pos, uint32_t to_offset, uint32_
 int
 db_queue_reshuffle(uint32_t item_id);
 
+int
+db_queue_inc_version(void);
+
 int
 db_queue_get_count();