chore(ui): remove unused class .small-menu-items (#9639)

Followup to https://codeberg.org/forgejo/forgejo/pulls/8399/files. That PR turned `small-menu-items` completely unused.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/9639
Reviewed-by: Michael Kriese <michael.kriese@gmx.de>

web_src/css/repo/list-header.css

@@ -25,25 +25,6 @@
   flex: 1;
 }
 
-.small-menu-items {
-  min-height: 35.4px !important; /* match .small.button in height */
-  background: none !important; /* fomantic sets a color here which does not play well with active transparent color on the item, so unset and set the colors on the item */
-}
-
-.small-menu-items .item {
-  background: var(--color-menu) !important;
-  padding-top: 6px !important;
-  padding-bottom: 6px !important;
-}
-
-.small-menu-items .item:hover {
-  background: var(--color-hover) !important;
-}
-
-.small-menu-items .item.active {
-  background: var(--color-active) !important;
-}
-
 @media (max-width: 767.98px) {
   .list-header-search {
     order: 0;