`theme_bw()` is hard-coded in some plots

[mjsteinbaugh]

Hi, I noticed that theme_bw() is called inside plotEnrichment(), which makes it more difficult to customize. Would it be possible to remove this?

See also: https://github.com/ctlab/fgsea/search?q=theme_bw&unscoped_q=theme_bw

The current ggplot2 recommendation is to instead use theme_set() to define themes globally, such as:

theme_set(theme_bw())

Best, Mike