window: don't specify window name in custom css
window: don't specify window name in custom css

Style context only affect the current widget and not children, so
we can safely use a star selector here, and know we are always
only targeting the window.
https://phabricator.endlessm.com/T11000

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