Fix border radius on hovered secondary menu (#31089)

Presumably a regression from
#30325, these menus were showing a
border radius on hover, which is fixed with this change.

<img width="154" alt="image"
src="https://github.com/go-gitea/gitea/assets/115237/eafdc1c5-3cf5-48d1-86c4-21c58f92cfaf">

web_src/css/modules/menu.css

@@ -512,11 +512,14 @@
   background: var(--color-hover);
 }
 
+.ui.secondary.menu .active.item {
+  border-radius: 0.28571429rem;
+}
+
 .ui.secondary.menu .active.item,
 .ui.secondary.menu .active.item:hover {
   color: var(--color-text-dark);
   background: var(--color-active);
-  border-radius: 0.28571429rem;
 }
 
 .ui.secondary.item.menu {