Fix 'Save data' in RealtimeWindow

A previous commit stopped disk updating from working, i.e. saving
workout data to a .csv file. This patch fixes that.

Fix supplied by Greg Lonnon, Fixes #254.

src/RealtimeWindow.cpp

@@ -389,6 +389,11 @@ void RealtimeWindow::Start()       // when start button is pressed
         if (status & RT_WORKOUT) {
             load_timer->start(LOADRATE);      // start recording
         }
+
+        if (recordSelector->isChecked()) {
+            status |= RT_RECORDING;
+        }
+
         if (status & RT_RECORDING) {
             QDateTime now = QDateTime::currentDateTime();