Fix DashboardRepoList margin (#31121)

Fixes: https://github.com/go-gitea/gitea/issues/31115

<img width="476" alt="image"
src="https://github.com/go-gitea/gitea/assets/115237/ba508ba9-b02d-47c6-ad9f-495101c81330">

web_src/js/components/DashboardRepoList.vue

@@ -509,10 +509,8 @@ ul li:not(:last-child) {
 }
 
 .repos-filter {
-  padding-top: 0 !important;
   margin-top: 0 !important;
   border-bottom-width: 0 !important;
-  margin-bottom: 2px !important;
 }
 
 .repos-filter .item {