Fixing typo 4.0.3 notextile element validation errors

I said in a previous article that Typo inserts notextile element tags into your articles wherever you choose to use the typo_code element tags to create ruby code blocks. My solution showed how to remove the tags after they'd been written but did not address the fact that if you wanted to be rid of them prior to them being written you'd need to hack typo's source code. Remove the notextile references from the two lines in question, 40 and 41 found here:

# http://www.typosphere.org/trac/browser/tags/release_4_0_3/components/plugins/textfilters/code_controller.rb#L40

# Here's what you'll basically want to see when it's done:
-sh-3.1$ diff code_controller.rb code_controller.bak
40,41c40,41
<     text.gsub!(/<pre>/,"<pre><code class=\"typocode_#{lang} #{cssclass}\">")
<     text.gsub!(/<\/pre>/,"</code></pre>")
---
>     text.gsub!(/<pre>/,"<pre><code class=\"typocode_#{lang} #{cssclass}\"><notextile>")
>     text.gsub!(/<\/pre>/,"</notextile></code></pre>")