Make doubly sure we enforce a cache reload.

src/Song.cpp

@@ -42,7 +42,7 @@
  * @brief The internal version of the cache for StepMania.
  *
  * Increment this value to invalidate the current cache. */
-const int FILE_CACHE_VERSION = 212;
+const int FILE_CACHE_VERSION = 213;
 
 /** @brief How long does a song sample last by default? */
 const float DEFAULT_MUSIC_SAMPLE_LENGTH = 12.f;