revert tstate_delete_common, since it's pretty much wrong

Python/pystate.c

@@ -425,13 +425,6 @@ PyThreadState_DeleteCurrent()
     _Py_atomic_store_relaxed(&_PyThreadState_Current, NULL);
     if (autoInterpreterState && PyThread_get_key_value(autoTLSkey) == tstate)
         PyThread_delete_key_value(autoTLSkey);
-    /*
-      Only call tstate_delete_common to have the tstate if we're not finalizing
-      or we're the main thread. The main thread will do this for us. Not calling
-      tstate_delete_common means we won't lock the interpreter head lock,
-      avoiding a possible deadlock with the GIL.
-    */
-    if (!_Py_Finalizing || _Py_Finalizing == tstate)
     tstate_delete_common(tstate);
     PyEval_ReleaseLock();
 }