Fix a terrible mistake in TIKI_FindTiki with uninitialized variable

This was using an uninitialized buffer to find the cached TIKI, in most configurations it always returned false, but when compiled with GCC it would return true

code/tiki/tiki_cache.cpp

@@ -83,6 +83,9 @@ dtiki_t *TIKI_FindTiki(const char *path)
     if (tikicache) {
         dtiki_t **t;
 
+        Q_strncpyz(filename, path, sizeof(filename));
+        FS_CanonicalFilename(filename);
+
         t = tikicache->find(filename);
         if (t) {
             return *t;