Bug 33233: Don't allow disabled attribute to remain when using browser's back button

Bug 33233: Don't allow disabled attribute to remain when using browser's back button

To test:
1. Go to OPAC advanced search and do a search using only one of the inputs.
2. Once the search is complete use the browser's back button to return to the advanced search.
3. Notice the unused inputs are disabled.
4. Apply patch and try again. Now the inputs should not be disabled.

Signed-off-by: Barbara Johnson <barbara.johnson@bedfordtx.gov>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 3811bb4381e34db7da1fd4593560fef519c4fde4)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>