Merge pull request #19017 from overleaf/jpa-server-pro-footer

[web] fix spacing for thin-footer as used in Server Pro/CE

GitOrigin-RevId: 8a20d93f10c5bce156647f67de991ff41a8a2017

services/web/frontend/stylesheets/core/scaffolding.less

@@ -43,7 +43,7 @@ body {
     padding-top: @header-height + @content-margin-vertical;
   }
 
-  .thin-footer {
+  &.thin-footer {
     .container {
       padding-bottom: @footer-height;
     }