bugfix lp:1158811

Launchpad Link: https://bugs.launchpad.net/goobi-production/+bug/1158811
Patch provided by Benjamin Moedinger (https://launchpad.net/~moedinger).

"The slash between the SID and COOKIE parts of the opac request url is urlencoded (GetOpac.retrievePicaTitle). Obviously the SWB interface doesn't accept this any more. Only the values for SID and COOKIE should be urlencoded (see attached patch for Goobi Version 1.8.4)."