Fix notif panel timestamp padding

This restores some space around the timestamp in the notif panel. We were
previously relying somewhat randomly on the presence on empty flair elements to
create space.

Fixes https://github.com/vector-im/element-web/issues/17580

res/css/structures/_NotificationPanel.scss

@@ -82,7 +82,6 @@ limitations under the License.
     color: $primary-fg-color;
     font-size: $font-12px;
     display: inline;
-    padding-left: 0px;
 }
 
 .mx_NotificationPanel .mx_EventTile_senderDetails {
@@ -103,6 +102,7 @@ limitations under the License.
     visibility: visible;
     position: initial;
     display: inline;
+    padding-left: 5px;
 }
 
 .mx_NotificationPanel .mx_EventTile_line {