Move settle started log statement to the start of dithering to match phdlogview

In the internal guider's guidelog, I moved the Settling Started info message to the start of dithering (instead of after dithering has finished moving). This was done since the guidelog is meant to be used with phdlogview, and phdlogview prefers it this way.

Please see the discussion here: https://indilib.org/forum/ekos/7895-internal-guider-log-dither-settling-info.html

To test, using the simulator:

• Move the mount away from the pole.
• start up guiding
• Set dithering to be, say, every 3rd capture.
• Start a capture sequence and run for several dithers.
• end the kstars/ekos session.
• Take the guidelog that was generated, and open it up in phdlogview.
• With the fix, you'll see phdlogview greys out the dithering sections, without the fix they're not greyed out.