[mod] favicons: simplify RTL in template & CSS

Comes from a sughgestion in:

- https://github.com/searxng/searxng/pull/3727#issuecomment-2388998803

Suggested-by: Bnyro <bnyro@tutanota.com>
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/static/themes/simple/src/less/style.less

@@ -232,6 +232,11 @@ article[data-vim-selected].category-social {
     }
   }
 
+  .url_header {
+    display: flex;
+    gap: 0.5rem;
+  }
+
   .url_wrapper {
     display: flex;
     align-items: center;