small navbar/sidebar dark-mode fixes
small navbar/sidebar dark-mode fixes

oyjt/AdminLTE,garrettwong/AdminLTE,oyjt/AdminLTE,almasaeed2010/AdminLTE,slachiewicz/AdminLTE,almasaeed2010/AdminLTE,oyjt/AdminLTE,garrettwong/AdminLTE,slachiewicz/AdminLTE