sim: Return st_size and st_mtime in stat result

That's how the real thing behaves.

sim/run.py

@@ -138,7 +138,7 @@ orig_stat = os.stat
 def _stat(path):
     res = orig_stat(path)
     # lmao
-    return os.stat_result((res.st_mode, 0, 0, 0, 0, 0, 0, 0, 0, 0))
+    return os.stat_result((res.st_mode, 0, 0, 0, 0, 0, res.st_size, 0, res.st_mtime, 0))
 
 
 os.stat = _stat