Don't apply :hover styles for .btn that follows a .btn-check

This removes a large part of the visual confusion of button checks/radios - that you currently have to move your mouse away from them to see what they actually changed to (checked or unchecked)

scss/_buttons.scss

@@ -39,7 +39,8 @@
   @include box-shadow(var(--#{$prefix}btn-box-shadow));
   @include transition($btn-transition);
 
-  &:hover {
+  :not(.btn-check) + &:hover,
+  &:first-child:hover {
     color: var(--#{$prefix}btn-hover-color);
     text-decoration: if($link-hover-decoration == underline, none, null);
     background-color: var(--#{$prefix}btn-hover-bg);