Ghost buttons active bg-color are not transparent

[jonasbirkelof]

When a ghost button (.btn-ghost-*) has the active state, tha background color is using the tint-color() mixin to give it a lighter golor than the theme color. This works on light/white backgrounds but on darker backgrounds it is just to bright.

The active background color should be transparent just like the hover background color.

I will make a PR with this change, but the quick fick for the source files is to change:

@mixin button-ghost-variant(
   $bg-color-active: tint-color($theme-color, 85%),
) {

to...

@mixin button-ghost-variant(
   $bg-color-active: #{$theme-color}2a,
) {

...in the file mixins\_bcss-buttons.scss.