[spotify] Move purge so Spotify files get cleared even on empty .spotify (closes #219)

src/spotify.c

@@ -1383,8 +1383,6 @@ logged_in(sp_session *sess, sp_error error)
 
   DPRINTF(E_LOG, L_SPOTIFY, "Login to Spotify succeeded. Reloading playlists.\n");
 
-  db_spotify_purge();
-
   pl = fptr_sp_session_starred_create(sess);
   fptr_sp_playlist_add_callbacks(pl, &pl_callbacks, NULL);
 
@@ -2058,6 +2056,8 @@ spotify_login(char *path)
   char *password;
   int ret;
 
+  db_spotify_purge();
+
   if (!g_sess)
     {
       if (!g_libhandle)