Bug 7277: Fixes display of subtitles in opac.

Bug 7277: Fixes display of subtitles in opac.

Adds comma and space to results display in opac between title and subtitles.
Also removes extra space before the subtitle in the results display of the staff pac.

Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
(cherry picked from commit 0ad771a68b5d60d7592b335934afcec3d7dc6c9e)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>
(cherry picked from commit f317028fa77e06a1cde2dc20cc6815086269a430)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>