Remove invalid {css $name} syntax

{css $foo} does not do anything. the correct syntax is

{css selector} (no dollar sign)
or
{css $prefix, selector}

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=152375039

java/google/registry/ui/soy/Forms.soy

@@ -32,7 +32,6 @@
   </label>
   <input id="{$name}"
          name="{$name}"
-         class="{css $name}"
          {if isNonnull($item) and isNonnull($item[$name])}
            value="{$item[$name]}"
          {/if}