Fix view's path to create_a_class.js
Fix view's path to create_a_class.js

a5c773d moved/renamed create_a_class.js into .../scorebook/,
but didn't update the view using it.

If this caused any problems or errors in `development` or `production`,
they apparently weren't visible and/or troublesome enough to get any
attention.

`spec/features/sign_up_spec.rb`, however, triggered

    Failure/Error: Unable to find matching line from backtrace
    ActionController::InvalidCrossOriginRequest:
      Security warning: an embedded <script> tag on another site requested
                        protected JavaScript.  If you know what you're doing,
                        go ahead and disable forgery protection on this action
                        to permit cross-origin JavaScript embedding.

Tracking it down was as educational as it was time-consuming...

cf https://github.com/bobmazanec/til/commit/db070f23357ee426058e52ea389447beeac31dc5

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