UI: Fix conditions for redraw the stats labels

After the commit 3491487c71 obs_frontend_get_streaming_output()
returns NULL if "Start Streaming" button not pressed yet.  The code
would erroneously fail to update the recording/streaming status if
either one of them hadn't been activated yet.

Closes jp9000/obs-studio#999
This commit is contained in:
Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f