Stream 3: Fix \WP_Stream\List_Table namespace so live updates work correctly

[rob]

On a fresh Stream 3 install, live updates fail silently with the following error:

PHP Fatal error:  Class 'WP_Stream\\WP_Stream_List_Table' not found in /[...]/wp-content/plugins/stream/classes/class-live-update.php on line 179

Due to PHP's namespaces, this needs to be \WP_Stream\List_Table or just List_Table, not WP_Stream_List_Table. This commit fixes this so live updates work correctly again like they should.

[lukecarbis]

Thanks so much @rob. Wow - how did you get that github username!?

Your PR looks great, and I've tested it and it works great. Would you mind issuing it against the develop branch instead of master?

Thanks.

[lukecarbis]

Also, I have no idea how I missed this.

[rob]

OK @lukecarbis, I just issued it against the develop branch.

And I registered this username when GitHub was first announced, I think. It sucks when people use the shorthand @rob to reference other people and I end up getting notifications though when it's not related to me. :-)