steplogger: Ensure today's data is updated when we provide it

Currently steps from the last six minutes do not appear in the data. We
can fix this by updating the data before creating the iterator.

Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>

wasp/steplogger.py

@@ -153,6 +153,11 @@ class StepLogger:
         now = time.localtime(self._t)
         if now[:3] == t[:3]:
             latest = self._data
+
+            # Work out where we are in the dump period and update
+            # with the latest counts
+            i = self._t % DUMP_PERIOD // TICK_PERIOD
+            latest[i] = wasp.watch.accel.steps - self._steps
         else:
             latest = None