Duplicate 'edit-submit' ID attributes on the page

This patch adds custom ids to search field and submit field (google-cse-query and google-cse-submit respectively).

The patch in #2 makes sense to me, based on the original issue report. Setting this to RTBC.

In the release for this issue, I think we need to call out this change, since it is possible that sites may have CSS styling (or, less likely JS), that targets the #edit-submit ID, and therefore, when updating to this change, the styling would cease to apply. I don't think that means we shouldn't do it, and I can't think of a way for us to provide a fallback; we just need to call it out.

Automatically closed - issue fixed for 2 weeks with no activity.