fix(NcAppNavigation): add border right

Signed-off-by: Marco Ambrosini <marcoambrosini@proton.me>
Co-authored-by: Ferdinand Thiessen <opensource@fthiessen.de>

src/components/NcAppNavigation/NcAppNavigation.vue

@@ -342,6 +342,7 @@ export default {
 	background-color: var(--color-main-background-blur, var(--color-main-background));
 	-webkit-backdrop-filter: var(--filter-background-blur, none);
 	backdrop-filter: var(--filter-background-blur, none);
+	border-inline-end: 1px solid var(--color-border);
 
 	&--close {
 		margin-left: calc(-1 * min($navigation-width, var(--app-navigation-max-width)));
@@ -388,13 +389,6 @@ export default {
 	}
 }
 
-// add extra border for high contrast mode
-[data-themes*='highcontrast'] {
-	.app-navigation {
-		border-right: 1px solid var(--color-border);
-	}
-}
-
 // When on mobile, we make the navigation slide over the NcAppContent
 @media only screen and (max-width: $breakpoint-mobile) {
 	.app-navigation {