Check Halpha filter order in flat field script

[dsand]

Mike Jones reported that Halpha flats were being taken first in the morning, when really they should be taken last, even after U-band. Maybe @pndaly and Manisha can check on this next time they are up there. Here is a quote from Mike:

FYI the morning flat script seems to be taking actual Halpha flats. It attempted to start about 10 min early. It started with Halpha (which doesn't really make sense in the morning, but I'm not complaining) and it took 1s exposures in an infinite loop until it had enough counts to do proper flats. Now it's moved on to U. So it seems like they are in the opposite order to what makes most sense.