UI: Fix conditions for redraw the stats labels

After the commit 3491487c 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

UI/window-basic-stats.cpp

@@ -240,7 +240,7 @@ void OBSBasicStats::Update()
 	obs_output_release(strOutput);
 	obs_output_release(recOutput);
 
-	if (!strOutput || !recOutput)
+	if (!strOutput && !recOutput)
 		return;
 
 	/* ------------------------------------------- */