ckeditor.js always loaded

Hi,

this addresses the following commit:
https://github.com/bestpractical/rt/commit/c1c91d2a1d65153a555a52698660f9db85670149

From the commit message it sounds really odd to me to always load the
130k ckeditor.js to have ability to disable ckeditor on some textareas
in RTIR.

The ckeditor is only used on very few pages within RT. Maybe there is a
better way to load the ckeditor.js only on the pages where it is needed
and only if $MessageBoxRichText is set to true.

Chris
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RT Training - Dallas May 20-21
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