[rcore] fix: TRACELOG upon successfully changing directory

InitWindow() prints CWD during initialization,
but ChangeDirectory() does not, which is quite confusing when you start
messing with CWD. Now said function should log similar message.

src/rcore.c

@@ -2354,6 +2354,7 @@ bool ChangeDirectory(const char *dir)
     bool result = CHDIR(dir);
 
     if (result != 0) TRACELOG(LOG_WARNING, "SYSTEM: Failed to change to directory: %s", dir);
+    else TRACELOG(LOG_INFO, "SYSTEM: Working Directory: %s", dir);
 
     return (result == 0);
 }