Remove 'hover' from nav-tabs-active-link-hover-color et al

Created by: janaagaard75

I seems to me that hover should be removed from these three variables, since the styles are applied to the tab, regardless of it being hovered or not. The has to has be active.

Current, v4-alpha.6, names:

$nav-tabs-active-link-hover-color
$nav-tabs-active-link-hover-bg
$nav-tabs-active-link-hover-border-color

Proposed corrected names:

$nav-tabs-active-link-color
$nav-tabs-active-link-bg
$nav-tabs-active-link-border-color