Fix pymain_run_stdin() in Modules/main.c to call pymain_start_pyrepl() instead of pymain_run_module(L"_pyrepl", 0)

This change is an equivalent to the one done in https://github.com/python/cpython/pull/120904/files#diff-79e40dbd94b164b5f42a960224cc7496e33c189b4c66a6810904eda7d703b6f2R600

Author: whitphx

Modules/main.c

@@ -570,7 +570,7 @@ pymain_run_stdin(PyConfig *config)
         int run = PyRun_AnyFileExFlags(stdin, "<stdin>", 0, &cf);
         return (run != 0);
     }
-    return pymain_run_module(L"_pyrepl", 0);
+    return pymain_start_pyrepl();
 }