Change peak flux reported in .fbeye file to relative flux units

[jradavenport]

This affects the flarestat function. Change to relative flux units, which it already computes for the ED calculation

https://github.com/jradavenport/FBeye/blob/master/fbeye_flarestat.pro#L115

Should be changed to:

lpeak = max(flux_n[f0:f1], peak_ind, /nan)

[jradavenport]

Should it be:

flux_norm = (flux - poly) / poly

?