Align show/hide outdated button on code review block (#11932)

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

web_src/less/_review.less

@@ -24,6 +24,12 @@
     &:not(.top) {
         margin-bottom: .5em;
     }
+
+    .show-outdated,
+    .hide-outdated {
+        display: block;
+        margin-left: auto;
+    }
 }
 
 .focus-lines-new .ui.button.add-code-comment.add-code-comment-right,