UI: Fix issue where rec time left would show negative time

The recording time left timer was being called an unnecessary time,
in the stats constructor, when it should have only been started
when the recording starts.

UI/window-basic-stats.cpp

@@ -176,7 +176,6 @@ OBSBasicStats::OBSBasicStats(QWidget *parent, bool closeable)
 	QObject::connect(&recTimeLeft, &QTimer::timeout, this,
 			&OBSBasicStats::RecordingTimeLeft);
 	recTimeLeft.setInterval(REC_TIME_LEFT_INTERVAL);
-	recTimeLeft.start();
 
 	OBSBasic *main = reinterpret_cast<OBSBasic*>(App()->GetMainWindow());