Dropdown.js: remove variable used only once (#2779)
Dropdown.js: remove variable used only once (#2779)

Co-authored-by: REJack <59bd0a3ff43b32849b319e645d4798d8a5d1e889@rejack.de>
oyjt/AdminLTE,garrettwong/AdminLTE,almasaeed2010/AdminLTE,slachiewicz/AdminLTE,almasaeed2010/AdminLTE,oyjt/AdminLTE,slachiewicz/AdminLTE,garrettwong/AdminLTE,oyjt/AdminLTE