Bug 31069: fix <span> in OPAC search suggestions (Did you mean)

Bug 31069: fix <span> in OPAC search suggestions (Did you mean)

== test plan ==
1. Enable "Did you mean?":
   . go to Administration > Additional parameters > Did you mean?
   . put a tick in each plugin and save the configuration
2. In the OPAC, search for 'open source'
3. Without the patch you see escaped <span> after "Did you mean:"

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>