Fix score box height

New css changes meant that the auto height wasn't working.  So we just
set it manually.

Fixes ots/clients/ardc/hypha-tracker#385: Review score box is very large

hypha/static_src/sass/components/_form.scss

@@ -36,6 +36,7 @@
         position: -webkit-sticky; // stylelint-disable value-no-vendor-prefix
         top: 0;
         margin-top: 10px;
+        height: 2.5rem;
     }
 
     &--error-inline {