“Time to put up or shut up” for David Ellison if he wants to own the Warner Bros. Discovery media empire – and he’s got a couple of weeks to decide. That’s the message coming from WBD’s mercurial CEO David Zaslav, according to sources close to the company, after WBD on Monday filed an amended proxy statement with the Securities and Exchange Commission, indicating to Wall Street it believes that it’s on track to hold an expedited shareholder vote to approve Netflix’s $72 billion acquisition of