Bug 8401 : Highlighting of search terms in preference causes loss of data

Bug 8401 : Highlighting of search terms in preference causes loss of data

To test:

1/ Go to system preferences
2/ Go to SCOUserCSS
3/ Add #self
4/ Search for self
5/ Open SCOUserCSS
6/ Note it now contains only # (Do not click save)
7/ Apply the patch
8/ Refresh the page, and check SCOUserCSS and note it now says #self
9/ Rejoice!

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Works nicely and passes all tests.
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>