UI: Avoid QT_TO_UTF8(QTStr()) double conversion

UI/window-basic-stats.cpp

@@ -39,9 +39,8 @@ void OBSBasicStats::OBSFrontendEvent(enum obs_frontend_event event, void *ptr)
 
 static QString MakeTimeLeftText(int hours, int minutes)
 {
-	return QString::asprintf("%d %s, %d %s", hours,
-				 QT_TO_UTF8(QTStr("Hours")), minutes,
-				 QT_TO_UTF8(QTStr("Minutes")));
+	return QString::asprintf("%d %s, %d %s", hours, Str("Hours"), minutes,
+				 Str("Minutes"));
 }
 
 static QString MakeMissedFramesText(uint32_t total_lagged,