Replace @input-background-color with an opaque color
Replace @input-background-color with an opaque color

This is necessary since `contrast()` used in https://github.com/atom/settings-view/pull/624 doesn't work with semi transparent colors.

torx-io/torx-dark-ui,torx-io/torx-dark-ui,Zeioth/atom-visual-studio-code-ui,torx-io/torx-dark-ui,torx-io/torx-dark-ui,torx-io/torx-dark-ui,torx-io/torx-dark-ui,torx-io/torx-dark-ui