https://github.com/go-gitea/gitea/pull/14028 had improved dropdown
triangle display for buttons with text but had regressed it for buttons
without. Fix this by adding a class to prevent horizontal margin adjustment.
Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>