Move load_audio into loading.c for consistency

include/loading.h

@@ -28,6 +28,7 @@
 #define LOADING_H
 
 #include "common.h"
+#include "music.h"
 #include <jansson.h>
 
 enum ICON_IDS_OFFSET {
@@ -115,6 +116,7 @@ void sort_by_filename(Entry_List_s * list);
 void delete_entry(Entry_s * entry, bool is_file);
 Result load_entries(const char * loading_path, Entry_List_s * list);
 bool load_preview(Entry_List_s list, int * preview_offset);
+Result load_audio(Entry_s, audio_s *);
 void load_icons_first(Entry_List_s * current_list, bool silent);
 void handle_scrolling(Entry_List_s * list);
 void load_icons_thread(void * void_arg);