DRY up get_style_context()
DRY up get_style_context()

This probably doesn't make a lot of difference, but we reduce four calls
in a row to get_style_context() to one.

[endlessm/eos-sdk#3886]

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib