Fix margin on attached segment headers when they are separated by other element (#11425)

Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

templates/user/settings/keys.tmpl

@@ -4,7 +4,6 @@
 	<div class="ui container">
 		{{template "base/alert" .}}
 		{{template "user/settings/keys_ssh" .}}
-		<br>
 		{{template "user/settings/keys_gpg" .}}
 	</div>
 </div>

web_src/less/_base.less

@@ -1225,7 +1225,7 @@ i.icon.centerlock {
 }
 
 /* https://github.com/go-gitea/gitea/issues/10210 */
-.ui.attached.segment + .ui.attached.header {
+.ui.attached.segment ~ .ui.attached.header {
     margin-top: 1rem;
 }