Adds relock_tracking_setup after setup_tracking_params finishes

[jlashner]

As @yuhanwyhan and @yaqiongl described in #372, setup_tracking_params leaves you in a bad state, where the tracking is only optimized for the last band run, which can lead to high noise on AMC0 since the lms_freqs may not be set correctly.

I believe the best way to fix this is to run relock_tracking_setup after finding the tracking params for each band, which will chose a frac_pp based on the optimal params for each of the running bands, and will adjust lms_freq for each band accordingly. I have been running this manually whenever I setup_tracking_params and I think it works well, but it makes sense to just build it into the function.

[msilvafe]

I agree with your changes. And given you've been running like this for awhile I think it's safe to merge.